Dometic Rm7030/Rm7732 Refrigerators Service Manual...Foreword This service manual is the result of...

ForewordThis service manual is the result of thededication of The Dometic Corporation andits engineers in giving service people thenecessary instruction for making accurateanalyses of certain conditions. Provided isa diagnostic chart leading a qualifiedmechanic into the service manual pages tolocate and solve symptoms which mayoccur. Dometic has continued itscommitment in providing service peoplewith this, the most up-to-date informationabout servicing Dometic RV accessories.

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form No. 3 106938.008 2/96 (Replaces OS1 684)

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DIAGNOSTIC SERVICE MANUALDOMETIC® RM7030/RM7732

Refrigerators

PAGE NO.CONTENTS

RM7030/RM7732 DIAGNOSTIC FLOW CHART ...........................1

SECTION 1OPERATION

1.1 RM7030 (Prod. #921890201 & 921890301)Refrigerator Operation .......................................................... 5

1.2 RM7030 (Prod. #921890401) Refrigerator Operation ................ 61.3 RM7732 Refrigerator Operation ............................................. 7

SECTION 2AC VOLTAGE

AC Voltage Requirements ..................................................... 9

SECTION 3AC COMPONENTS

Heating Element .................................................................. 9

SECTION 4DC VOLTAGE

DC Voltage Requirements ..................................................... 9

SECTION 5DC COMPONENTS

5.1 Thermostat: RM7030 (Prod. No. 921890201 & 921890301) ....... 95.2 Thermistor: RM7030 (Prod. No. 921890401) & RM7732 .......... 105.3 Thermistor Adjuster: RM7030 (Prod.No. 921890401) & RM7732 105.4 Solenoid Valve ................................................................... 105.5 Igniter ............................................................................... 115.6 High Voltage Cable ............................................................ 115.7 Fuses ............................................................................... 125.8 Upper Circuit Board ............................................................ 125.9 Lower Circuit Board ............................................................ 155.10 Door Switch....................................................................... 175.11 Electrode .......................................................................... 185.12 Climate Control Heater ....................................................... 18

SECTION 6LP GAS

LP Gas Requirements ........................................................ 18

SECTION 7LP GAS COMPONENTS

7.1 Manual Gas Shutoff Valve ................................................... 197.2 Orifice .............................................................................. 207.3 Thermocouple ................................................................... 207.4 Burner .............................................................................. 217.5 Flue Baffle ........................................................................ 217.6 Flue Cap (RM7030 Only) .................................................... 21

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DOMETIC® RM7030/RM7732Refrigerators

DIAGNOSTIC SERVICE MANUAL

CONTENTS PAGE NO.

SECTION 8WIRING

8.1 External Wiring .................................................................. 218.2 Internal Wiring ................................................................... 21

SECTION 9OTHER

9.1 Leveling ............................................................................ 259.2 Ventilation ......................................................................... 259.3 Air Leaks .......................................................................... 259.4 Door Position ..................................................................... 279.5 Ambient Temperature ......................................................... 279.6 Cooling Unit ...................................................................... 279.7 Food Storage .................................................................... 279.8 High Humidity .................................................................... 279.9 Interior Liner Seal to Frame ................................................. 28

SECTION 10ICE MAKER

Ice Maker Operation ........................................................... 29

SECTION 11ICE MAKER COMPONENTS

11.1 Mold Heater ...................................................................... 2911.2 Ice Ejector......................................................................... 2911.3 Mold Thermostat ................................................................ 2911.4 Shutoff Arm ....................................................................... 3011.5 Mold Switches ................................................................... 3011.6 Timing Motor ..................................................................... 3011.7 Water Valve ...................................................................... 3011.8 Ice Maker Assembly ........................................................... 31

SECTION 12ICE MAKER � OTHER

12.1 Water Fill Adjustment.......................................................... 3412.2 Wiring ............................................................................... 3512.3 Water Supply ..................................................................... 35

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Refrigerators

This program will address the most common system problems associated with the Dometic RM7030/RM7732refrigerators supplied by The Dometic Corporation. Our intent is to provide you with a guideline of checks to make,should you encounter one of the following symptoms.

1. No operation � no panel lights

2. No operation � has panel lights

3. Operating OK � no panel lights

4. No AC operation � operates on gas

5. No Gas operation � operates on AC

6. Insufficient cooling on all modes.

7. Insufficient cooling on AC � cools properlyon gas.

REFRIGERATOR SECTION

RM7030 REFRIGERATOR SECTION:Product No. 921890201 & 921890301SYMPTOM CAUSE REFER TO STEP

Operation 1.1 ADC Volts 4 AFuse 5.7 AWiring 8.1, 8.2Upper Circuit Board 5.8 ALower Circuit Board 5.9 A,D

Operation 1.1 AThermostat 5.1Upper Circuit Board 5.8 ASolenoid 5.4 AWiring 8.2Lower Circuit Board 5.9 B,C,D

DC Volts 4 AWiring 8.2Upper Circuit Board 5.8 B through ILower Circuit Board 5.9 D

Operation 1.1 AAC Volts 2Heating Element 3Upper Circuit Board 5.8 B,CWiring 8.2Thermostat 5.1Lower Circuit Board 5.9 B

Operation 1.1 ALP Gas 6Manual Gas Valve 7.1Igniter 5.5 AHigh Voltage Cable 5.6 AElectrode 5.11Solenoid 5.4 AUpper Circuit Board 5.8 B,D,EWiring 8.2Lower Circuit Board 5.9 C

Ventilation 9.2Leveling 9.1Ambient Temperature 9.5Air Leaks 9.3Thermostat 5.1Cooling Unit 9.6

AC Volts 2Heating Element 3

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8. Insufficient cooling on gas � cools properly onAC.

9. Freezes on all modes.

10. Changes preset mode.

11. Flame failure light within 10 seconds.

12. Flame failure light after 3 minutes.

13. Interior light ON when door is closed.

14. Rapid formation of frost.

15. Water on frame.

SYMPTOM CAUSE REFER TO STEP

LP Gas 6Orifice 7.2Flue Baffle 7.5Flue Tube 7.7Flue Cap 7.6Burner 7.4

Thermostat 5.1DC volts 4 A

DC Volts 4 AWiring 8.1Lower Circuit Board 5.9 A,B,C,D

Igniter 5.5 AHigh Voltage Cable 5.6 AElectrode 5.11Wiring 8.2

LP Gas 6Manual Gas Valve 7.1Solenoid 5.4 AOrifice 7.2Burner 7.4Wiring 8.2Thermocouple 7.3 A

Wiring 8.2Door Switch 5.10Door Position 9.4

Food Storage 9.7Interior Liner to Frame 9.9High Humidity 9.8Air Leaks 9.3

Interior Liner to Frame 9.9High Humidity 9.8Air Leaks 9.3Climate Control Heater 5.12

Operation 1.1B or 1.2DC Volts 4 BFuse 5.7 BWiring 8.1 & 8.2Upper Circuit Board 5.8 JLower Circuit Board 5.9 E

Operation 1.1B or 1.2DC volts 4 BThermistor 5.2Fuses 5.7 BUpper Circuit Board 5.8 JWiring 8.2Lower Circuit Board 5.9 E,F,G

RM7030 (Prod. No. 921890401)& RM7732

16. No operation � no panel lights

17. No operation � has panel lights

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Refrigerators


18. No AC operation � operates on gas.

19. No gas operation � operates on AC

20. Insufficient cooling on all modes.

21. Insufficient cooling on AC � cools properly ongas.

22. Insufficient cooling on gas � cools properly onAC.

23. Freezes.

24. Changes preset mode.

25. Check light on.

Operation 1.1B or 1.2AC Volts 2Fuse 5.7 BHeating Element 3Upper Circuit Board 5.8 JWiring 8.2Lower Circuit Board 5.9 E,F

Operation 1.1B or 1.2LP gas 6Manual Gas Valve 7.1Igniter 5.5 BHigh Voltage Cable 5.6 BElectrode 5.11Solenoid 5.4 BUpper Circuit Board 5.8 JWiring 8.2Lower Circuit Board 5.9 E,G

Ventilation 9.2Leveling 9.1Ambient Temperature 9.5Air Leaks 9.3Thermistor 5.2Cooling Unit 9.6Thermistor Adjuster 5.3

AC Volts 2Heating Element 3Lower Circuit Board 5.9 E,F

LP Gas 6Orifice 7.2Flue Baffle 7.5Flue Tube 7.7Flue Cap (RM7030 Only) 7.6Burner 7.4Lower Circuit Board 5.9 E,G

Thermistor 5.2Thermistor Adjuster 5.3Lower Circuit board 5.9 E,F,GUpper Circuit Board 5.8 J

Operation 1.1B or 1.2DC Volts 4 BWiring 8.1Upper Circuit Board 5.8 JLower Circuit Board 5.9 E

DC Volts 4Wiring 8.2LP Gas 6Manual Gas Valve 7.1Solenoid 5.4 BOrifice 7.2Burner 7.4Lower Circuit Board 5.9 E,GThermocouple 7.3 B

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26. Interior light on when door is closed.

27. Rapid formation of frost.

28. Water on frame.

ICE MAKER SECTION29. Ice Maker fails to start.

30. Ice Maker won't make ice.

31. Keeps making ice and won't shut off.

32. Not making enough ice.

33. Too much water is coming out.

34. Ejector blade frozen into ice cubes.

35. Unit is hooked-up � no water comes in.

36. Ice maker is running but won't make cubes.

37. Ice maker will not eject ice.


Wiring 8.2Door Switch 5.10Door Position 9.4

Food Storage 9.7Interior Liner to Frame 9.9High Humidity 9.8Air Leaks 9.3

Interior Liner to Frame 9.9High Humidity 9.8Air leaks 9.3Climate Control Heater 5.12

Operation 10Arm in UP Position 11.4AC Voltage 2Water Valve 11.7Ice Maker Cycle 11.8

Blades frozen in ice 12.1AC Voltage 2Water Valve 11.7Ice Maker Cycle 11.8

Shutoff Arm 11.4

Operation 10Mold Thermostat 11.3Cube Size 12.1Ice Maker Cycle 11.8

Water Fill Adjustment 12.1Water Valve 11.7

Water Fill Adjustment 12.1Water Valve 11.7

Water Supply 12.3Water Valve 11.7

Water Supply 12.3Shutoff Arm 11.4Mold thermostat 11.3Hold Switch 11.5

Ice Ejector 11.2Mold Heater 11.1Timing Motor 11.6

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Refrigerators

AES FULLY AUTOMATIC MODETurn switch "C" to the "ON" position. The bulb abovepush-button "A" will light up green, indicating that thecontrol system is in the fully automatic mode. In thismode, 120 volts AC operation has first priority, meaningthe refrigerator will operate on 120 volts AC whenever itis available. If 120 volts AC is not available, the systemwill automatically switch to LP gas operation. Thethermostat inside the refrigerator cabinet cycles theelement/burner as required to maintain the desiredtemperature.

NOTE: The AES controls will automatically go to thefully automatic mode each time switch "C" is turned"ON".

LP GAS OPERATIONWhen there is no electrical power available (120 voltsAC) or if the indicator lamp above button "B" is ON, theAES system will switch to LP gas operation. When thethermostat in the refrigerator cabinet calls for cooling,the following sequence takes place:A. A high voltage spark is created above the burner.B. Power is sent to a solenoid which opens the gas

control, allowing LP gas to flow to the burner. Thespark ignites the LP gas and the small flame pro-vides heat for the boiler.

C. The electrode mounted above the burner tubemonitors the flame continuously. If the flame shouldfail for any reason, the high voltage spark will startimmediately and relight the flame.

When the thermostat reaches the desired temperature,it will shut off the gas flame completely. The system willremain on standby until cooling is again required.

LP GAS ONLY OPERATIONTurn switch "C" to the "ON" position and press push-button "B". The green indicator lamp over push-button"B" will come on and the refrigerator will operate only onLP gas even if 120 volts are available. When the vehicleengine is turned "OFF", the AES system initiates a 25minute delay, preventing the refrigerator from operatingon LP gas.

LP GAS DELAY MODEWhen the vehicle engine is turned off, the AES systeminitiates a delay cycle which prevents the refrigeratorfrom operating on LP gas for 25 minutes. The purposeof the delay is to avoid having a gas flame burning dur-ing a refueling stop at a gas station (see WARNING).

If the vehicle engine is restarted during this delay pe-riod, the LP gas operation will not start until the delayperiod is over. This means each time the vehicle engineis stopped, the complete 25 minute delay cycle will takeplace. If 120 volt AC becomes available during this de-lay cycle, the AES system will start operation in the 120volt AC mode immediately, unless the push-button "B"(LP gas only) has been pressed.

If the RV is stopped somewhere other than a gas sta-tion, you may wish to cancel the delay cycle. To do this,turn the main system switch to "OFF" for several sec-onds, then turn the main system switch back to "ON"and the system will immediately start operation in theLP gas mode.

Most LP gas appliances used in recreational ve-hicles are vented to the outside of the vehicle. Whenparked close to a gasoline pump, it is possible thatthe gasoline fumes could enter this type of appli-ance and ignite from the burner flame, CAUSING AFIRE OR AN EXPLOSION.

FOR YOUR SAFETY, it is recommended that all LPgas appliances which are vented to the outsideshould be shut off when refueling.

The AES system is designed to turn off the LP flameduring refueling stops by the use of the delay cycleexplained previously. However, you must rememberthat the delay cycle will be activated only if therefrigerator is properly connected to the vehicleengine electrical circuit.

If the refrigerator is not connected to the engine bythe ignition lock wiring, the refrigerator must beshut off during refueling. To do this, turn the mainsystem switch "C" to "OFF". Only after the vehiclehas been moved away from the refueling areashould the main system switch "C" be turned backON.

SECTION 1

1.1 OPERATIONRM7030 (Product No. 921890201 & 921890301)

OFF ON AC

A B C D E F G H

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FLAME FAILURE DURING LP GASOPERATIONIf the LP gas flame fails during the burner cycle, thehigh voltage spark will continue arcing for up to threeminutes.

At the end of three minutes the gas control will stop theflow of LP gas to the burner, the sparking will stop andthe red indicator lamp "H" will light up. LP gas operationwill not be possible as long as this indicator is ON.

To restart LP gas operation, turn the main systemswitch "C" to "OFF" for five seconds and then back ON.This will reset the AES controls and turn off the flamefailure indicator "H". The system will start another cyclefor gas ignition.

If the refrigerator has not been used for a long time orthe LP tanks have just been refilled, air may be trappedin the supply lines. To purge the air from the lines mayrequire resetting (turning OFF and ON) the On/Offswitch "C" three or four times.

If repeated attempts fail to start the LP gas operation,check to make sure that the LP gas supply tanks arenot empty and all manual Shutoff valves in the lines areopen.

NOTE: If you are in the AES mode when the flamefailure light "H" comes on, the mode indicator lamp "A"(green light) will go out. If 120 volt AC power becomesavailable during this period, the mode indication lampwill come on showing that the refrigerator is operatingon another energy source. The red lamp "H" will remainon until the AES system is reset with an OFF/ONoperation of the main switch "C". If you have selectedthe LP gas only mode (control button "B"), the 120 voltfunction has been locked out. If the burner fails to light,the green lamp over button "B" will go out and the redlamp "H" will glow indicating flame failure. Even if 120volts is available, the refrigerator cannot switch toelectric operation and all cooling will stop. This fact mustbe considered when selecting "gas only" operation.

120 VOLTS AC OPERATIONSince 120 volt AC is usually the most economicalsource for operation of the refrigerator, the AES controlsystem is designed to select this mode whenever it isavailable. The only exception to this is when push-button "B" (LP gas only mode) is selected. The 120 voltheating elements attached to the boiler provide the heatnecessary to operate the cooling system. The thermo-stat controls the power ON and OFF to the elementsand maintains the desired temperature.

LOW VOLTAGE MONITORThe AES system requires 12 volts DC power at all timesto operate properly. The DC power must be 9.5 voltsDC or higher. If the DC voltage drops below 9.5 voltsDC, the AES system will switch to an emergencycooling mode.

1. The mode indicator lamp will go off (green light);2. The system will revert to continuous LP gas

operation, with no thermostat control.

The refrigerator will continue to operate in the emer-gency mode until the DC power supply is increased to10.5 volts DC. When 10.5 volts is reached, the modeindicator light (green) will come back on and normaloperation will resume.

During the low voltage condition, the interior light willoperate normally.

THERMOSTATThe refrigerator is equipped with a thermostat that canbe adjusted to maintain various temperatures. Turn theknob clockwise toward "MAX" for a lower temperatureand for a warmer temperature � turn the knob counter-clockwise toward "MIN". Set the thermostat approxi-mately mid-range and adjust it toward "MIN" or MAX" toobtain the desired cabinet temperatures. Remember, atthe "MAX" setting, the heating element/burner is runningcontinuously and the lower cabinet temperatures areobtained.

1.2 RM7030 (Product No. 921890401)

AES MODE1. Move the AES mode selector button (2) to the

DOWN position. If 120 volts AC is available, the ACmode indicator lamp "A" will illuminate indicating ACoperation. If 120 volts AC is not available, the GASmode indicator lamp "C" will illuminate and thecontrol system will automatically switch to GASoperation.

2. If the CHECK indicator lamp "D" illuminates and theGAS mode indicator lamp "C" is off, the controlshave failed to ignite the burner in the GAS mode.GAS operation may be reset by pressing main powerON/OFF button (1) to the OFF then ON position.

AES DISPLAY PANEL

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Refrigerators

3. Press the TEMPERATURE SELECTOR button (3)until the lamp at the desired position is illuminated.

4. When operating in the AES mode, the AES modeindicator lamp "B" will illuminate. The control systemwill automatically select between AC and GASoperation with AC having priority over GAS. Eitherthe AC indicator lamp "A" or the GAS indicator lamp"C" will illuminate depending on the energy sourceselected by the control system. If the control systemis operating with AC energy and it then becomesunavailable, the system will automatically switch toGAS. As soon as AC becomes available again, thecontrol will switch back to AC regardless of thestatus of GAS operation.

GAS MODE1. Move the AES mode selector button (2) to the UP

position. The GAS mode indicator lamp "C willilluminate. After 45 seconds the burner should beignited and operating normally.

2. On the initial refrigerator start-up, it may take longerthan 45 seconds to allow air to be purged from thegas line. If the gas does not ignite within 45 seconds,the CHECK indicator lamp "D" will illuminate and theGAS mode indicator lamp "C" will go off. To resetwhen the CHECK indicator lamp "D" is illuminated,press the main power ON/OFF button (1) to the OFFthen ON position.

If the control is switched to AC operation whilethe CHECK indicator lamp is on, it will functionproperly, but the CHECK indicator lamp will not gooff until the main power ON/OFF button is pressed tothe OFF then ON position.NOTE: Do not continue to reset GAS operation ifthe CHECK indicator lamp continues to be illumi-nated after several tries. If repeated attempts fail tostart the LP gas operation, check to make sure thatthe LP gas supply tanks are not empty and allmanual shutoff valves in the lines are open.

3. Press the TEMPERATURE SELECTOR button (3)until the lamp at the desired position is illuminated.

THERMOSTATThe thermostat on the refrigerator controls both the gasand electric operation, thereby eliminating the necessityof resetting each time a different energy source isemployed.

After the initial start-up, the thermostat should be movedfrom "COLDEST" to the desired temperature setting,usually about mid-setting.

STANDBY MODE OF OPERATIONThis control system contains a feature where it willcontinue to operate the cooling system in the event of afailure of a major operating component. Two differentmodes of operation can occur in this category.

If for some reason the display module becomes non-functional, the control system will revert to fully auto-matic operation � selecting the best energy sourceavailable with AC and GAS priority. The temperature ofthe refrigerator will be maintained at the MID positionwithin normal temperature tolerances. The powermodule will continually attempt to reestablish operationof the display module.

The second standby mode of operation will executewhen a failure of the temperature sensing device orassociated electronic circuitry occurs. If this shouldoccur, the control system will operate on the energysource selected via the control panel. The cooling unitwill run continuously on the selected energy source. Therefrigerator will continue to operate in this mode indefi-nitely or until a new sensor is installed and the system isreset.

1.3 RM7732 REFRIGERATOR OPERATION

A C D E

2-WAY DISPLAY PANEL

B

AUTO MODEPress the AUTO mode selector button (2) to the DOWNposition. If 120 volts AC is available, the AC modeindicator lamp (A) will illuminate indicating AC operation.If 120 volts AC is not available, the GAS mode indicatorlamp (C) will illuminate and the control system willautomatically switch to GAS operation.

If the CHECK indicator lamp (D) illuminates and theGAS mode indicator lamp (C) is OFF, the controls havefailed to ignite the burner in the GAS mode. GASoperation may be reset by pressing the main power ON/OFF button (1) to the OFF then ON position. (See GASMODE.

Press the TEMPERATURE SELECTOR button (3) untilthe lamp at the desired position is illuminated.

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GAS MODEMove the AUTO mode selector button (2) to the UPposition. The GAS mode indicator lamp (C) will illumi-nate. After 45 seconds the burner should be ignited andoperating normally.

On the initial refrigerator start-up, it may take longerthan 45 seconds to allow air to be purged from the gasline. If the gas does not ignite within 45 seconds, theCHECK indicator lamp (D) will illuminate and the GASmode indicator lamp (C) will go off. To reset when theCHECK indicator lamp (D) is illuminated, press mainpower ON/OFF button (1) to the OFF then ON position.NOTE: DO NOT continue to reset GAS operation ifthe CHECK indicator lamp continues to be illumi-nated after several tries.Press the TEMPERATURE SELECTOR button (3) untilthe lamp (E) at the desired position is illuminated.

THERMOSTATThe thermostat on the refrigerator controls both the gasand electric operation, thereby eliminating the necessityof resetting each time a different energy source isemployed.

After the initial start-up, the thermostat should be movedfrom "COLDEST" to the desired temperature setting isusually about mid-setting.

TO SHUT OFF THE REFRIGERATORThe refrigerator may be shut off while in any mode ofoperation by pressing the main power ON/OFF button(1) to the UP (OFF) position. This shuts off all DC powerto the refrigerator, including the interior light.

DESCRIPTION OF OPERATINGMODES

AUTO MODEWhen operating in the AUTO mode, the AUTO modeindicator lamp (B) will illuminate. The control system willautomatically select between AC and GAS operationwith AC having priority over GAS. Either the AC indica-tor lamp (A) or the GAS indicator lamp (C) will illuminatedepending on the energy source selected by the controlsystem. If the control system is operating with ACenergy and it then becomes unavailable, the system willautomatically switch to GAS. As soon as AC becomesavailable again, the control will switch back to ACregardless of the status of GAS operation.

GAS MODEWhen operating in the GAS mode, the AUTO modeindicator lamp (B) will be off and the GAS mode indica-tor lamp (C) will be illuminated. This mode provides LPgas operation only. The control system will activate theignition system and will attempt to light the burner for aperiod of approximately 45 seconds. If unsuccessful,the CHECK indicator lamp (D) will illuminate and theGAS mode indicator lamp (C) will turn off.

To restart GAS operation, press the main power ON/OFF button (1) to the OFF and then ON position. Thecontrol system will attempt a new 45 second ignitionsequence.

If the refrigerator has not been used for a long time orthe LP tanks have just been refilled, air may be trappedin the supply lines. To purge the air from the lines mayrequire resetting the main power ON/OFF button (1)three or four times. If repeated attempts fail to start theLP gas operation, check to make sure that the LP gassupply tanks are not empty and all manual shutoffvalves in the lines are open.

If the control is switched to AC or DC operation whilethe CHECK indicator lamp is on, it will function properly,but the CHECK indicator lamp will not go off until themain power ON/OFF button is pressed to the OFF thenON position.

STANDBY MODE OF OPERATIONThis control system contains a feature where it willcontinue to operate the cooling system in the event of afailure of a major operating component. Two differentmodes of operation can occur in this category.

If for some reason the display module becomes non-functional, the control system will revert to full automaticoperation selecting the best energy source availablewith AC as first priority, and GAS as the second priority.The temperature of the refrigerator will be maintained atthe MID position within normal temperature tolerances.The power module will continually attempt to reestablishoperation of the display module.

The second standby mode of operation will executewhen a failure of the temperature sensing device orassociated electronic circuitry occurs. If this shouldoccur, the control system will operate on the energysource selected via the control panel. The cooling unitwill run continuously on the selected energy source. Therefrigerator will continue to operate in this mode indefi-nitely or until a new sensor is installed and the system isreset.

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Refrigerators

SECTION 2

AC VOLTAGE REQUIREMENTSThe refrigerator is a 120 volt AC, 60 Hz appliance. Theproper operating range is 100 to 132 volts. Check theAC volts at the receptacle where the refrigerator isattached. If voltage is outside of the proper operatingrange, correct the power source problem.

On RM7030 (Product No. 921890401) and RM7732, ifvoltage drops below 100 volts, cooling efficiency willdecrease with voltage decrease. The refrigerator will notswitch to another mode of operation until all AC poweris lost.

SECTION 3AC COMPONENTS�HEATING ELEMENTThe heating element is designed to deliver a predeter-mined amount of heat to the cooling unit. To check aheating element, remove the heater leads from theprinted circuit board and measure for proper resistanceacross the two leads with a properly calibrated ohmmeter. This check is to be done with the heating ele-ment at room temperature. The proper ohms for each ofthe two RM7030 and RM7732 heating elements is 69,with a tolerance of ten percent. If the resistance isoutside the tolerance range, replace the heating ele-ment.

SECTION 4

DC VOLTAGE REQUIREMENTS

A. RM7030 (Product No. 921890201 &

921890301)For the refrigerator to operate on any mode, DC voltagemust be supplied to the terminals at the rear of therefrigerator and must be connected directly to thebattery of the RV. The operational range is 10.5 to 15volts DC. Connecting the refrigerator to an unregulatedconverter can result in improper operation of the refrig-erator. Do not use the body or chassis of the RV as asubstitute for either of the two conductors. Properpolarity is crucial for the operation of the refrigerator.Check for proper voltage at the positive and negative

terminals at the back of the refrigerator. If power isoutside the operational range, correct the power supplyproblem. The power supply to the refrigerator must befused. Maximum fuse size: 5 amps.

With the refrigerator operating on AC or gas mode, ifvoltage to the refrigerator slowly drops to or below 9.5volts DC, the gas flame will come on and will not bethermostatically controlled. Low DC volts (below 9.5)could cause over-cooling.

B. RM7030 (Prod. No. 921890401) & RM7732For the refrigerator to operate on any mode, DC voltagemust be supplied to the terminals at the rear of therefrigerator.

The operational range of the unit is a minimum of 9.6VDC to a maximum of 22V DC. The unit will automaticallyshut down until voltage has decreased to 18V DC. Therefrigerator requires at least 9.6V DC for proper opera-tion; however, the panel lights will continue to illuminateuntil voltage has dropped to 4V DC or below.

Connecting the refrigerator to an unregulated convertercan result in improper operation of the refrigerator. Donot use the body or chassis of the RV as a substitute foreither of the two conductors. Proper polarity is crucialfor refrigerator operation. Check for proper DC voltageat the positive and negative terminals at the back of theunit. If the voltage is outside the operational range,correct the power supply problem.

SECTION 5

DC COMPONENTS

5.1 THERMOSTATRM7030 (Product No. 921890201 & 921890301)The thermostat operates on DC volts and regulates theinside refrigerator temperature on all modes, by makingand breaking the circuit to the printed circuit board. Theinternal mechanism breaks contact (continuity) whenadequate cabinet temperature has been reached.Check the thermostat for continuity. This check shouldbe made at room temperature with the thermostatturned all the way to MAX. Another check would be touse a jumper wire with insulated clips and bypass thethermostat.

NOTE: Use care when doing this test. Do not short tothermostat casing. Also remove jumper after testing iscompleted.

If the above test allows the refrigerator to operate and/or the continuity test proves the thermostat to bedefective, replace the thermostat. A defective thermo-stat would cause insufficient cooling, no cooling orfreezing on all modes.

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5.2 THERMISTORRM7030 (Prod. No. 921890401) and RM7732

To determine if the temperature sensor is functioningproperly, perform the following test.

Remove the cover from the lower circuit board. Discon-nect the thermistor harness from the P2, 2-pin terminalon the lower circuit board. Place thermistor in a glass ofice water. Wait 2 to 3 minutes. Using an ohm meter,place a probe on each terminal point. You should get areading of approximately 7,000 to 10,000 ohms. Normalfailure for this type of device is to have a very highresistance. A defective thermistor could cause an over-cooling condition on all modes.

5.3 THERMISTOR ADJUSTERRM7030 (Product No. 921890401) and RM7732The thermistor adjuster is a resistor-type componentthat attaches between the thermistor and the lowerboard. Its function is to allow the refrigerator to reachtemperatures below the normal 46° to 35°F. range(setting 1 through 5 on upper circuit board).

To determine if the thermistor adjuster is operatingproperly, do an ohms resistance check across theterminals. Proper ohms reading is approximately 23,200ohms ± 10%.

5.4 SOLENOID VALVEA. RM7030 (Product No. 921890201 & 921890301)The solenoid valve assembly is a safety valve as well asa gas flow valve. When the AES selects LP gas opera-tion, DC volts are sent to the solenoid coil which opensthe internal valve.

Check the solenoid coil with a properlycalibrated ohm meter. Remove theconnector from the solenoidand measure the resis-tance across the upperand lower terminals. Theproper reading would be20 ohms with a toler-ance range of tenpercent. Once flame islit, the thermocoupleproduces the voltage to keepthe valve open. If for any reason the thermocouple doesnot provide enough current to the valve, it will close,stopping the flow of gas. To check this portion of thesolenoid valve assembly, verify the thermocouple isgood (see Sec. 7.3A), the tip is clean and the receptaclein the solenoid valve assembly is clean. If the thermo-couple checks good, then replace the solenoid valveassembly.NOTE: If the solenoid ohms check shows an open coil,the refrigerator will not operate on any mode.

P2

THERMISTORADJUSTER

TO THERMISTOR

NOTE: Dometic refrigerators do not come equipped with athermistor adjuster. This is an add-on component.

THERMISTORADJUSTER

TO THERMISTOR

B. RM7030 (Product No. 921890401) and RM7732When the refrigerator selects LP gas operation, DCvolts are sent to the solenoid coil which opens theinternal valve.

Check the solenoid coil with a properly calibrated ohmmeter. Remove the connector from the solenoid andmeasure the resistance across the terminals. Theproper reading would be 49 ohms with a tolerancerange of ten percent.

P1

P2

P3

Thermistorunpluggedfrom PCBoard

11


Refrigerators

Next, hook up a manometer atthe test port. Thencheck for DC volts atgas valve terminalswhile the unit is intrial-for-ignition. If DCvolts are present andpressure is low,replace the valve. If DCvolts are not present atthe valve while unit is intrial-for-ignition, verify that the wires at Plug 3,Terminal 1 and 2 on lower circuit board have DC volts(9 or more). If the valve chatters, check for low inputvoltage to the valve (below 9V DC).

5.5 IGNITERA. RM7030 (Product No. 921890201 & 921890301)

The igniter is an electronic device that produces highvoltage to create a spark at the burner, only on gasmode. It also produces an increased DC voltage at the"L" terminal which is a signal to the circuit board that aspark has been produced. First verify proper voltage atthe positive (+) and ground (�) terminals. The readingshould be within one volt of incoming voltage at themain terminal block. A voltage drop of more than onevolt would indicate a loose connection (see Sec. 8.2) ora circuit board problem (see Sec. 5.9A to 5.9D).

Next, disconnect DC power at refrigerator terminalblock. Remove high voltage cable from igniter. Recon-nect DC power � the igniter should produce sparkingsound. If not, replace the igniter. With the igniter pro-ducing spark, connect meter leads to "L" and ground (�)terminals on the igniter, with the meter set on 20 voltsDC range or lower. The meter should read a pulsatingvoltage. If not, replace the igniter.

NOTE: If a spark is notproduced within 10seconds, the gas flamewarning lamp will illumi-nate. If spark is producedit will take 3 minutes forlamp to illuminate.If all of the previouschecks are correct, theigniter is good � do notreplace.

B. RM7030 (Product No. 921890401) and RM7732The igniter is an electronic device that produces highvoltage to create a spark at the burner, only on gasmode.

First, verify proper voltage at the positive (+) andground (�) terminals. The reading should be within onevolt of incomingvoltage at the mainterminal block duringtrial-for-ignition.If no voltage ispresent, see Sec.5.9E to 5.9G.

Next, disconnect DC powerat refrigerator terminal block.Remove high voltage cablefrom igniter. Reconnect DCpower, the igniter shouldproduce a sparking soundduring trial-for-ignition. If not,replace the igniter.

5.6 HIGH VOLTAGE CABLEA. RM7030 (Product No. 921890201 & 921890301)Disconnect DC power at the refrigerator terminal block.Disconnect high voltage cable from electrode. Recon-nect DC power. If sparking starts, cable is good (seeSec. 5.11). If no sparking, disconnect DC power. Ifsparking sound from igniter, then replace high voltagecable.

B. RM7030 (Product No. 921890401) and RM7732Disconnect DC power at the refrigerator terminal block.Disconnect high voltage cable from electrode. Recon-nect DC power. If sparking starts during trial-for-ignition,the cable is good (see Sec. 5.11). If there is no sparkingduring trial-for-ignition, disconnect DC power anddisconnect high voltage cable at the igniter. ReconnectDC power. If there is a sparking sound from the igniterduring trial-for-ignition, then replace high voltage cable.

HIGH VOLTAGE

12



5.7 FUSESA. RM7030 (Product No. 921890201 & 921890301)The fuse is to protect the circuit board. To check thefuse, remove it from the holder and do a continuitycheck. If no continuity, replace it with a proper 3-amptime delay fuse.

B. RM7030 (Product No. 921890401) and RM7732The fuses are to protect the circuit board and theintegrity of the heater circuit(s) against shorts.

The 3-amp DC fuse is designed to protect the circuitboard from internal shorts. The 5-amp AC fuse isdesigned to protect the integrity of the AC heater circuitfrom shorts.

To check the fuses, remove from the holder and do acontinuity check. If no continuity, replace with a properamperage fuse.NOTE: Determine the cause of the fuse failure andcorrect before replacing fuse.

7-PINCONNECTOR

6-PINCONNECTOR 10-PIN

CONNECTOR

5.8 UPPER CIRCUIT BOARDRM7030 (Product No. 921890201 & 921890301)A. ON-OFF SWITCHNOTE: The following checks should be made on theupper circuit board and harness assembly BEFOREreplacing the upper circuit board or wiringharness. The checks are to be done with thewiring harness REMOVED from the lowercircuit board.

With the switch in the "ON" position:CONTINUITY should be indicated be-tween the orange terminal to the yellowterminal on the 10-pin connector.

ORANGEYELLOW

10 PIN

CONTINUITY should be indicated betweenthe brown terminal to the red terminal on the10-pin connector.

BROWNRED

10 PIN

YELLOWGREEN

10 PIN

REDBLUE

10 Pin7 Pin

NO continuity should be indicated betweenthe yellow terminal to the green terminalon the 10-pin connector.

NO continuity should be indicatedbetween the red terminal on the 10-pin connector to the blue terminalon the 7-pin connector.

With the switch in the "OFF"position:

CONTINUITY should be indicatedbetween the yellow terminal to the greenterminal on the 10-pin connector.

YELLOWGREEN

10 PIN

REDBLUE

10 Pin7 Pin

CONTINUITY should be indicatedbetween the red terminal on the 10-pin connector to the blue terminal onthe 7-pin connector.

NO continuity should be indicatedbetween the orange terminal to theyellow terminal on the 10-pin connector.

NO continuity should be indicated between thebrown terminal to the red terminal on the 10-pin connector.

NOTE: If any of these checks on the ON�OFFswitch are not correct, verify the wire harnesshas continuity. If the wire harness is good,replace the upper circuit board.

BROWNRED

10 PIN

ORANGEYELLOW

10 PIN

13


Refrigerators

B. AES FUNCTION SWITCHNOTE: The following checks should be made on theupper circuit board and harness assembly BEFOREreplacing the upper circuit board or wiring harness.The checks are to be done with the wiring harnessREMOVED from the lower circuit board, and the ON-OFF switch turned to "ON".

With the AES function switch manuallydepressed:CONTINUITY should be indicatedbetween the blue terminal and theblack terminal on the 7-pin connector.

With the AES function switch NOTdepressed:NO continuity should be indicatedbetween the blue and black terminalson the 7-pin connector.

NOTE: If the check on AES function switch is notcorrect, verify the wire harness has continuity. If wireharness is good, replace the upper circuit board.

C. AES FUNCTION LAMPNOTE: The following checks should be made on theupper circuit board and harness assembly BEFOREreplacing the upper circuit board or wiring harness.These checks are to be done with the wiring harnessREMOVED from the lower circuitboard and the ON�OFF switchturned to "ON".

Measure resistance between thebrown terminal on the 7-pinconnector (positive [+] lead frommeter) to the brown terminal onthe 10-pin connector (negative[�] lead from meter). The proper resistance isapproximately 26,000 ohms.

NOTE: If the check on the AES function lamp is notcorrect, verify the wire harness has continuity. If wireharness is good, replace the upper circuit board.

D. GAS FUNCTION SWITCHNOTE: The following checks should be made on theupper circuit board and harness assembly BEFOREreplacing the upper circuit board or wiring harness.The checks are to be done with the wiring harnessREMOVED from the lower circuit board and the ON-OFF switch turned to "ON".

BROWNBROWN

10 Pin7 Pin

BLACKBLUE

7 Pin

With the gas function switchmanually depressed: CONTI-NUITY should be indicatedbetween the violet terminal onthe 10-pin connector to theblue terminal on the 7-pinconnector. With the gasfunction switch NOT de-pressed:A reading would NOT be indicated.

NOTE: If the check on gas function switch is notcorrect, verify the wire harness has continuity. If wireharness is good, replace the upper circuit board.

E. GAS FUNCTION LAMPNOTE: The following checks should be made on theupper circuit board and harness assembly BEFOREreplacing the upper circuit board or wiring harness.These checks are to be done with the wiring harnessREMOVED from the lowercircuit board, and the ON�OFFswitch turned to "ON".

Measure resistance between thebrown terminal on the 10-pinconnector (negative [�] leadfrom meter) to the white terminalon the 10-pin connector (positive[+] lead from meter). The properohms resistance is approxi-mately 26,000 ohms.

NOTE: If the check on gas function lamp is notcorrect, verify the wire harness has continuity. If wireharness is good, replace the upper circuit board.

F. AC MODE LAMP AND SWITCHNOTE: The following checks should be made on theupper circuit board and harness assembly BEFOREreplacing the upper circuit board or wiring harness.These checks are to be done with the wiring harnessREMOVED from the lower circuit board, and the ON-OFF switch turned to "ON".

With the mode switch (?) manually depressed:Resistance should be indicated between the brownterminal on the 10-pin connector (negative [�] leadfrom meter) to thered terminal on the 7-pin connector (posi-tive [+] lead frommeter). The properresistance is approxi-mately 26,000 ohms.

7 PIN 10 PIN

VIOLETBLUE

WHITEBROWN

10 PIN

7 PIN 10 PIN

RED BROWN

14



With the mode switch (?) NOT depressed: Areading would NOT be indicated.

NOTE: If the check on AC mode lamp and switch isnot correct, verify the wire harness has continuity. Ifwire harness is good, replace the upper circuitboard.

G. DELAY MODE LAMP AND SWITCHNOTE: The following checks should be made on theupper circuit board and harness assembly BEFOREreplacing the upper circuit board or wiring harness.The checks are to be done with the wiring harnessREMOVED from the lower circuit board, and theOFF-ON switch turned to "ON".

With the mode switch (?) manually depressed:Resistance should be indicated between the brownterminal on the 10-pin connector (negative [�] leadfrom meter) to the yellow terminal on the 7-pinconnector (positive [+] lead from meter). The properresistance is approximately26,000 ohms.

With the mode switch (?) NOTdepressed: A reading would NOTbe indicated.

NOTE: If the check on the delaymode lamp and switch is notcorrect, verify the wire harnesshas continuity. If wire harness is good, replace theupper circuit board.

H. GAS MODE LAMP AND SWITCH:NOTE: The following checks should be made on theupper circuit board and harness assembly BEFOREreplacing the upper circuit board or wiring harness.The checks are to be done with the wiring harnessREMOVED from the lower circuit board, and the ON-OFF switch turned to "ON".

With the mode switch (?) manually depressed:Resistance should be indicated between the brownterminal on the 10-pin connector (negative [�] leadfrom meter) to the green terminalon the 7-pin connector (positive [+]lead from meter). The properresistance is approximately 26,000ohms.

With the mode switch (?) NOTdepressed: A reading would NOTbe indicated.

NOTE: If the check on gas mode lamp and switch isnot correct, verify the wire harness has continuity. Ifwire harness is good, replace the upper circuitboard.

YELLOW BROWN

10 Pin7 Pin

BROWN

10 Pin7 Pin

GREEN

I. GAS FLAME WARNING LAMP:NOTE: The following checks should be made on theupper circuit board and harness assembly BEFOREreplacing the upper circuit board or wiring harness.The checks are to be done with the wiringharness REMOVED from the lower circuitboard, and the OFF-ON switch turned to"ON".

Measure resistance between the brownterminal on the 10-pin connector (negative[�] lead from meter) to the black terminal onthe 10-pin connector (positive [+] lead frommeter). The proper resistance is approxi-mately 22,000 ohms.

NOTE: If the check on gas flame warning lamp is notcorrect, verify the wire harness has continuity. If wireharness is good, replace the upper circuit board.

J. RM7030 (Product No. 921890401) and RM7732NOTE: The PAL tester will allow for proper testing of theintegrity of the upper and lower circuit boards. PAL isavailable from your Dometic parts distributor.

NOTE: Each of the following tests should be doneaccording to pin locations. The wire colors mayvary.

With main ON/OFF switch on display panel in OFFposition:Check for DC voltage at Plug 1, Terminal 4 and terminal5 negative (�) DC on the lower circuit board. If novoltage, then check fuse condition. Replace if blown.Check for DC voltage between J4 and J10 terminals onthe lower circuit board. If fuse is good and there isbattery voltage at J4, remove and replace lower circuitboard.Next, check for DC voltage at the upper circuit boardbetween terminal 4 (orange or white wire) and terminal3 (black wire) which is negative (�) DC. If no voltage,and your previous check proved voltage at the lowercircuit board between these wires, replace the cableassembly. If DC volts are present, proceed to the nextcheck.

BLACK

BROWN

10 Pin

UPPER CIRCUIT BOARD

15


Refrigerators

DIAGNOSTIC MODENOTE: The PAL tester will allow for propertesting of the integrity of the upper and lowercircuit boards. PAL is available from your Dometicparts distributor.

This control system has an integral Diagnostic/Test sequence.

Access to the diagnostic sequence unit is bymeans of the ON/OFF Power Switch and theTemperature Selector Switch. With the PowerSwitch in the OFF position, hold the TemperatureSelector Switch in the DOWN position. Whilekeeping the Temperature Selector Switch in theDOWN position, move the main power ON/OFFSwitch to the ON (DOWN) position. Hold theTemperature Selector Switch DOWN for three (3)seconds. The control will indicate that the diag-nostics have been entered by illuminating each ofthe Mode Indicator Lamps and the TemperatureIndicator Lamps one at a time in sequence. Eachlamp is illuminated twice. The Check Lamp willthen flash ON and OFF and #1 position Tempera-ture Indicator will remain illuminated. The testsequence can be operated automatically ormanually. For AUTO step sequence, press theAUTO/GAS Mode Selector Switch to the DOWNposition. The AUTO Mode Indicator will illuminate.

If each lamp illuminates during the check, the displaycircuit board is good.

In automatic test mode, each load is activated forapproximately four (4) seconds then released.The control system will automatically exit thediagnostic sequence in approximately four (4)minutes or when power is turned OFF.

The Temperature Indicator Lamps are used toindicate which part of the control system is beingtested. When position #1 is illuminated, thecontrol is in an idle position with all output loadsoff. To activate the first load simply push theTemperature Selector Switch.

All of the checks listed below are done on the lowercircuit board.

The manual test sequence is as follows:

Position #1: Idle Position, all loads off.Position #2: Activate AC Heater. Check for AC volts

at terminals J7 and J8.Position #3: Activate Gas Solenoid. Check for DC

volts at Gas Solenoid white wire (-) andyellow wire (+).

Position #4: Idle position. All loads OFF.Position #5: Activate spark ignition system. Check

for DC volts to (+) terminal of igniterand ground.

If you experience a problem on any of the abovechecks, verify the fuses on the lower circuit boardare good.

If all checks prove to be good, and the refrigera-tor does not operate on electric mode, replacethe lower circuit board. It has been damaged byAC volts in excess of 180 volts.

5.9 LOWER CIRCUIT BOARDRM7030 (Product No. 921890201 & 921890301)The circuit board controls all modes of operation.

A. DC VOLTS

THESE PROCEDURES MUST BE FOLLOWED INSEQUENCE AND AT THE PROPER TERMINALS ORDAMAGE TO THE BOARD WILL RESULT.

Before any checks are to be done, besure proper DC volts are to the board.Measure volts between yellow terminalon the 6-pin connector (positive [+] leadfrom meter) to green terminal on 6-pinconnector (negative [�] lead frommeter). Voltage should be the same asat the positive (+) and negative (�)terminal block. If not, check the fuse and wiring.

With main ON/OFF switch on display panel in ONposition:

Check for DC volts between terminal 3 (red wire), (�)negative and terminal 5 (green wire) and terminal 1(black wire). If there is no voltage, the ON/OFFswitch on upper circuit board is defective. Replacethe upper circuit board. If voltage is present, the ON/OFF switch is good.

Next, do the same voltage test at the lower circuitboard. Negative (�) plug 1, terminal 5 (red wire), toplug 1, terminal 1 (green wire) and plug 1, terminal 3(black wire). If there is no voltage and you hadvoltage on previous test, the cable assembly isdefective and you must replace it. If voltage ispresent, the ON/OFF switch on the upper circuitboard and cable assembly is good.

YELLOWGREEN

6 PIN

16



C. GAS OPERATION


Before you check the circuit board for gas operation,verify these components are good:Igniter (Sec 5.5A) High Voltage Cable (Sec. 5.6A)Electrode (Sec. 5.11) Solenoid (Sec. 5.4A)Upper Circuit Board (Sec. 5.8A to 5.8I)Thermostat (Sec. 5.1)

Also be sure NO voltage is present at theIGN lock terminal, and delay mode is notactivated. First, check that voltage inexcess of 10.5 volts is between the yellowterminal on the 6-pin connector (positive[+] lead from meter) to the ground strip(negative [�] lead from meter). If less than10.5 volts, correct wiring and/or powersource problem.

Next, check for the pulse voltage from the igniter atthe orange terminal on the 6-pin connector (negative[�] lead from meter) and the ground strip (positive [+]lead from meter). If there is no signal voltage, checkthe igniter (see Sec. 5.5A) and the orange wire andconnections. If signal voltage is present, next check

YELLOW

6 Pin

ORANGE

6 Pin

for voltage on the solenoid wires at thecircuit board. Positive lead from meter tothe gray wire and negative lead from themeter to the black wire. If voltage is 9.5volts or more, the circuit board is good. Donot replace. If no voltage is present, replacethe circuit board.

D. DC VOLTS TO UPPER CIRCUIT BOARD


This check is to determine if thelower circuit board is providingvoltage to the upper circuit board.Measure between the brownterminal on the 10-pin connector(positive [+] lead from meter) tothe blue terminal on the 7-pinconnector (negative [�] lead frommeter). A voltage reading indi-cates the circuit board is good. Ifno voltage is present, replace the circuit board.NOTE: Before changing the circuit board, be sure alltroubleshooting steps have been followed.

BROWNBLUE

10 Pin7 Pin

RM7030 (Product No. 921890401) & RM7732E. DC VOLT: ALL TESTS ARE TO BE DONE WITH

THE REFRIGERATOR IN THE COOLING MODE.

Before any checks are made, make sure the boardis receiving proper DC volts. Measure volts betweenterminal J4 and the ground strip. Voltage should bethe same as at the positive (+) and negative (-) onthe terminal block. If not, check for loose connec-tions.

F. AC MODE: NOTE: The PAL tester will allow forproper testing of the integrity of the upper and lowercircuit boards. PAL is available from your Dometicparts distributor.

ALL TESTS ARE TO BE DONE WITH THE REFRIG-ERATOR IN THE COOLING MODE.

For AC heating element operation, check thatincoming AC voltage is present at terminals J5 andJ6 on the circuit board. If voltage is below 100 volts,see Sec. 2.

B. AC OPERATION

THESE PROCEDURES MUST BE FOLLOWED INSEQUENCE AND AT THE PROPER TERMINALSOR DAMAGE TO THE BOARD WILL RESULT.

For AC heating element operation, check that voltage ispresent between the large black and large white wire atthe circuit board. If voltage is below 100 volts, the circuitboard will select another mode. If voltage is above 100volts, check that AC volts are present at the heatingelement connection. If no voltage is present, change thecircuit board.

NOTE: Before installing a new circuit board, correct thecause of the failure, most likely it is the heating ele-ments or wiring.

If voltage is present, DO NOT CHANGE THE CIRCUITBOARD. Check the following components: heatingelements, upper circuit board, thermostat and wiring.

17


Refrigerators

Check for voltage at the heating element connectionterminals J7 and J8 on the circuit board. If novoltage is present, check the 5 amp AC and 3 ampDC fuses. If fuse is defective, replace the fuse. Iffuses are good, replace the circuit board.

G. GAS MODE: NOTE: The PAL tester will allow forproper testing of the integrity of the upper and lowercircuit boards. PAL is available from your Dometicparts distributor.

ALL TESTS ARE TO BE DONE WITH THE REFRIG-ERATOR IN THE COOLING MODE.

Before checking the circuit board for gas operation,verify that the following components are good: UpperCircuit Board, Thermistor and 3 Amp Fuse.

NOTE: Each of the following tests should bedone according to pin locations. The wire colorsmay vary.

First, check for voltage during trial-for-ignition(approximately 45 seconds) at Plug 3, Terminals 1(white wire) and 2 (yellow wire) to the solenoid. If novoltage is present, change the circuit board. Ifvoltage is present, check for voltage at the solenoid.If voltage is not present, check the wires and con-nections.

Next, check for voltage to the igniter. If no voltage ispresent, check the wires. If good, then change thecircuit board. If voltage is present, this portion of theboard is good.

NOTE: When millivolts to the lower circuit board are10 ± 3, the power to Plug 3, Terminal 4 (blue wire)will be shut off. If flame extinguishes during thecooling mode, the circuit board will not supplyvoltage to Plug 3, Terminal 4 (blue wire) again untilthe millivolts have decreased to 10±3. This processcould take up to 15 seconds or longer.

To check the flame sense circuit of the lower circuitboard, operate the refrigerator on GAS mode, thenmeasure the millivolts between J3 terminal and theother wire connection from the thermocouple. Themillivolt meter should read between 25 to 35 milli-volts with the gas flame burning. Next, turn themanual shutoff valve to OFF and watch the millivoltreading as it drops. Note the millivolt reading whenPlug 3, terminal 4 (blue wire) receives power. Itshould be 10±3 millivolts or 7 to 13.

Repeat this test several times. If the igniter fails tospark on any test sequence, it should be replaced.

If the millivolt readings vary more than 1 to 2 MVfrom one test to the other when power is supplied toPlug 3, terminal 4, replace the lower circuit board.

NOTE: Verify all connections are clean and tightbefore replacing either component.

5.10 DOOR SWITCHThe door switch is an open switch when the switch armis depressed (interior light should be off). When therefrigerator door is open the switch is closed (interiorlight should be on). Check that the switch assembly isproperly aligned and that it is not broken. Check theswitch assembly for continuity.

NOTE: To do a continuity check, first be sure all poweris disconnected or OFF to the refrigerator. Second,remove all wires from the switch assembly, then checkthe switch. After the check, be sure the switch assem-bly is wired properly per the wiring diagram.

When the switch arm is depressed, there should not becontinuity. When the switch arm is NOT depressed,there should be continuity. If any of these checks areincorrect, replace the switch.

P1

P2

P3

J1 J2 J3 J4 J5 J6 J7 J8 J103 AMP FUSE

FIVEAMPFUSE

Black 3

Open 2

Green 1

6 Brown

5 RedOpen 3Blue 4

1 White1 White

2 Yellow

4 Orangeor White

4 Orangeor White

18



5.11 ELECTRODEFirst, do a visual check forcracks or breaks on theceramic insulator.Verify themountingbracket isattachedproperly tothe elec-trode. Ifeither of the above is found, replace the electrode. Thespark gap must be set at three sixteenths (3/16") of aninch and tip of electrode above the slots in the burner.

If igniter (see Sec. 5.5A or B) and high voltage cable(see Sec. 5.6A or B) are good and there is no spark atthe tip of the electrode, replace the electrode.

5.12 CLIMATE CONTROL HEATERThe climate control is a switch operated DC electricheater. Its primary function is to warm the frame of therefrigerator during high temperature/high humidityconditions. This prevents the formation of condensationon the metal frame.

To check the switch, disconnect the wires and do acontinuity check. In the OFF position, there should beno continuity. In the ON position, there should be acontinuity reading.

ELECTRODETIP

3/16"

BURNER

To check the heater itself, do an ohms resistancereading on the heater wire by using a properly cali-brated ohm meter. The proper ohms reading is 34 ohms± 10%. The approximate amp draw is less than .5 (1/2)amp.

NOTE: The climate control will draw DC power continu-ously. It should be turned off when charging source isnot available.

SECTION 6

LP GAS REQUIREMENTSThe LP gas pressure to the refrigerator should be 11inches water column with half of all BTU's of the RVturned on. With all other appliances off, the pressure tothe refrigerator should not exceed 12 inches watercolumn. To check the gas pressure when the refrigera-tor is operating, there is a pressure test port on thesolenoid.

SOLENOID VALVE

TEST PORT

TEST PORT

RM7030 (Product No. 921890201 & 921890301)

RM7030 (Product No. 921890401) and RM7732

19


Refrigerators

SECTION 7

LP GAS COMPONENTS7.1 MANUAL GAS Shutoff VALVEThe manual gas shutoff valve is where the incoming LPgas supply is attached. To check the shutoff valve,remove and inspect for any obstructions. The valvemust be turned to "ON" before any gas operation canoccur.

MANUAL GASShutoff VALVE

RM7030 (Product No. 921890201 & 921890301)


20



7.2 ORIFICEThe orifice is a small brass fitting that has a rubymembrane that is laserbeam drilled and is mounted onthe gas line just prior to the burner. The orifice iscleaned by using an alcohol based solvent and allowingto air dry.

NEVER USE A DRILL BIT OR JET TIP CLEANER TOCLEAN ANY ORIFICE AS THESE DEVICES WILLDAMAGE THE FACTORY MACHINED PART ANDCREATE A POTENTIALLY DANGEROUS CONDI-TION.

If there is lack of cooling on gas operation, verify theorifice is the proper size (#73).

7.3 THERMOCOUPLEA. RM7030 (Product No. 921890201 & 921890301)The thermocouple is a component extending above theburner assembly so the tip is in the path of the flame. Itwill produce 14 to 30 millivolts DC in normal operation.To check the thermocouple, use a known good safety

valve and attach to the thermocouple. Next, supplyflame to tip of the thermocouple for a few momentswhile depressing the safety valve. Remove the flameand release the safety valve.

The valve should hold for at least 30 seconds. If it doesnot hold the safety valve open for 30 seconds, replacethe thermocouple. If it does hold for 30 seconds ormore, the thermocouple is good � do not replace it.NOTE: Be sure the tip on the thermocouple is clean.

B. RM7030 (Product No. 921890401) & RM7732The thermocouple is a component extending above theburner assembly so the tip is in the path of the flame.During normal gas operation, the thermocouple shouldproduce 25 to 35 millivolts when connected to the lowercircuit board. Any reading below 18 millivolts couldcause erratic gas operation. NOTE: A reading of 18 orless could be caused by low gas pressure or improperthermocouple location.


PRESSURE TESTPORT

ORIFICE

THERMOCOUPLE

ELECTRODE

BURNER TUBE

RM7030 (Product No. 921890201 & 921890301)

21


Refrigerators

7.4 BURNERThe burner is a slotted metal tube located below the fluetube on the cooling unit. It should be level, and the slotsin the burner should be directly below the flue tube. Theburner should be cleaned periodically, at least once ayear. To clean the burner, remove from the refrigeratorand check for any foreign residue that could cause adeflection of the gas flow or the flame. Next, soak theburner in an alcohol based solvent and allow to air dry.After cleaning, reinstall in the refrigerator.

7.5 FLUE BAFFLEThe flue baffle is designed to concentrate the heat (fromthe gas flame) at a certain area of the flue tube. Itshould be cleaned periodically, at least once a year. Toclean, remove from the flue tube and check for anydamage, then clean thoroughly.

The length of the flue baffle assembly (flue baffle andwire) should be 39 inches on RM7030; 40 inches onRM7732. The flue baffle itself should measure 13/16inch wide and 6 inches long on RM7030 and RM7732.The proper position of the baffle above the burner is 1inch.

7.6 FLUE CAP (RM7030 ONLY)The flue cap is located at the top of the flue tube and isattached with a screw. It must be properly attached orflame outage could occur.

7.7 FLUE TUBEThe flue is a component of thecooling unit. It must be cleanedperiodically, at least once a year. Toclean, remove flue cap and fluebaffle, then cover the burner andclean by using a flue brush, Domet-ic Part No. 0151404001. If the fluetube becomes coated with scale orresidue from combustion of LP gas,the efficiency of gas operationdecreases.

NOTE: After cleaning be sure toreinstall the flue baffle and flue cap.

FLUECAP

FLUETUBE

SECTION 8

WIRING8.1 EXTERNAL WIRINGA. 120 Volts AC Connection

The refrigerator is equipped with a three-prong(grounded) plug for protection against shock hazardsand should be plugged directly into a properlygrounded three-prong receptacle. Do not cut orremove the grounding prong from this plug.

B. 12 Volt DC ConnectionConnection is made to the main terminal block. Therefrigerator must be connected to the battery circuitwith two wires of adequate capacity to avoid voltagedrop.

The wire gauge should be a minimum of 14 gauge.

RM7030 (Poduct No. 921890201 & 921890301)C. Ignition Lock Connection

In order for the circuit board to perform certainfunctions, it must receive a signal when the vehicleengine is running. The signal wire (16 gauge mini-mum) should originate at the run terminal of theignition switch and connect to the "IGN Lock" posi-tion on the refrigerator terminal block.

Do not use the body or chassis of the vehicle as asubstitute for either of the two conductors. No otherelectrical equipment or lighting should be connectedto the refrigerator circuit.

8.2 INTERNAL WIRINGCheck all wires at the connectors to be sure of a properand tight connection. Also verify the refrigerator is wiredper the wiring diagram for the exact model you areworking on. See the following typical wiring diagrams.NOTE: Improper wiring at the lower circuit board couldcause erratic operation and lower circuit board failure.

(Wiring diagrams continued on next page)

22



TYPICAL WIRING DIAGRAM FOR

RM7030 (PRODUCT NO. 921890201 & 921890301)

23


Refrigerators

TYPICAL WIRING DIAGRAM FOR

RM7030 (PRODUCT NO. 921890401)

6

1

1

C

S

B

L

BLACKBROWNREDORANGE

GREEN

A5B5C5

D5E5

B2A2

WHITEWHITE

J6

J5

J4

J3

J2

J7

J1

0

J8

O P

A

A3

B3

C3

F

G

71 2

3

U

N N

K

H

2

M

R2

+-

1

2

4

P3

E

4

5

1

I

J

12V DC

2

D

21

1

12

2

WHITE

YELLOW

BLUE

TT T

1

120 VOLTS AC

A

B

CIRCUIT BOARD POWER

CIRCUIT BOARD DISPLAY

D

C

GAS VALVE

THERMISTOR

ELECTRODEG

THERMOCOUPLE

REIGNITER

F

E

K

L

ABSORPTION UNIT

SWITCH

TERMINAL BLOCK

TERMINAL STRIP

I

J

RETAINER FOR BURNERH

N HEATER 120V AC

P

O

FUSE 5A

FUSE 3A

SWITCH

HEATING CABLE

R

Q

M LIGHT

U RETAINER FOR

TERMINAL BLOCK

TERMINAL BLOCK

S

T

CIRCUIT BOARD POWER

5

6

GREY

BROWN

7 BLUE

GREEN

GREEN/YELLOW

3

4

BLACK

WHITE

2

1

Q

24



RM7732 TYPICAL WIRING DIAGRAM

25


Refrigerators

SECTION 9

OTHER9.1 LEVELINGIn an absorption refrigerator system, ammonia isliquefied in the finned condenser coil at the top of therefrigerator. The liquid ammonia then flows into theevaporator (inside the freezer section) and is exposedto a circulating flow of hydrogen gas, which causes theammonia to evaporate, creating a cold condition in thefreezer.

The tubing in the evaporator section is specificallysloped to provide a continuous movement of liquidammonia downward by gravity through this section. Ifthe refrigerator is operated when it is not level and thevehicle is not moving, liquid ammonia will accumulate insections of the evaporator tubing. This will slow thecirculation of hydrogen and ammonia gas, or in severecases, completely block it, resulting in a loss of cooling.

Any time the vehicle is parked for several hours with therefrigerator operating, the vehicle should be level toprevent this loss of cooling. The vehicle needs to beleveled only so it is comfortable to live in (no notice-able sloping of floors or walls).

When the vehicle is moving, the leveling is not critical asthe rolling and pitching motion of the vehicle will pass toeither side of level, keeping the liquid ammonia fromaccumulating in the evaporator tubing.

9.2 VENTILATIONVentilation is one of the requirements for proper coolingunit operation. The coach vent system must be able toprovide a way to direct the hot air produced by theaction of the cooling unit, out away from the installationof the refrigerator.

The refrigerator extracts heat from the interior of therefrigerator cabinet and dissipates the heat out throughthe vent system. In a proper installation there should be

as little open space as possible surrounding the sidesand top of the refrigerator to achieve proper air flow. Allpotential dead air pockets should be blocked or baffledto ensure that heat won't be trapped in these spacesand reduce efficiency.

NOTE: Refrigerators should be installed in accordancewith appropriate installation instructions received withthe refrigerator.

9.3 AIR LEAKSCheck the gasket on the doors to be sure of a positiveair seal. A simple method to check gaskets is to closethe door on a dollar bill, then pull the dollar bill out. If noresistance is felt, the gasket is not sealing properly. Thisshould be done on all four sides of the door. If a gasketis not sealing properly, first warm the gasket materialwith a hair drier.

DO NOT OVERHEAT AS YOU CAN MELTTHE MATERIAL.

Then close the door and the magnetic strip should pullthe gasket to the metal frame. Leave door closed untilthe material has cooled. Then recheck for a positiveseal. If a positive seal cannot be achieved, replace thegasket. Also check that the cooling unit is installedproperly. The cooling unit's foam block, the portion thatsurrounds the evaporator coils, must be flush to thecabinet at the back of the refrigerator and have apositive seal. If the cooling unit is not installed properly,remove and install properly.

RM7030:The refrigerator is secured in the enclosure with sixscrews and they must be installed in the following order:

First Two Screws installed on front base;Second Two Screws installed in the top frame;Third Two Screws installed in the rear base.

Failure to follow the sequence in securing refrigerator inenclosure cancause leakagebetween theframe andcabinet.NOTE: Airleaks willcause insuffi-cient coolingas well asrapid forma-tion of frost.

0" CLEARANCEFROM SIDE OFCABINET

PATH OFAIR FLOW

CLEARANCEFROM

COMBUSTIBLEMATERIALS

2ND

1ST

3RD

26



RM7732:SECURING THE REFRIGERATOR:After the refrigerator is mounted in place (ensuring acombustion seal at the front frame), the refrigerator is tobe secured in the enclosure with six screws. The screwshave to be installed in the following order:

STEP 1: Two screws installed through the frontbase, which includes the lower front strip installa-tion.The refrigerator is provided with a lower front strip(shipped as a loose part). The front strip is to beattached after the refrigerator is set into the cutoutopening.

A. Install the lower front strip by maneuvering it underthe bottom hinge plates, as shown in FIG. 7.

B.Secure the refrigerator and the lower front strip withtwo screws: One screw through each hinge. SeeFIG. 8.

STEP 2: Install the two screws in the top frame.A. The top decoration panel must be removed from

the refrigerator before the screws can be in-stalled. Open refrigerator door and gently pushthe tabs out of the hole in the hinge with flat bladescrewdriver. See FIG. 9.

FIG. 7

FIG. 8

B. Carefully tilt the top decoration panel and lift up toremove from top frame. See FIG. 9.

C. Install the second two screws in the top frame asshown in FIG. 10.

STEP 3: Two screws installed in the rear base.See FIG. 11

Failure to follow the sequence in securing refrigera-tor in the enclosure can cause leakage between theframe and cabinet.

FIG. 9

USE SCREWDRIVERTO PUSH TABS OUTOF HOLE

FIG. 10

FIG. 11

Screws

27


Refrigerators

9.4 DOOR POSITIONThe door position can be checked by observing anymisalignment of the door in relation to the frame.

NOTE: Improper position of the refrigerator door cancause the interior light to stay on when the door isclosed.

To adjust either door, loosen the hinge bracket screws,reposition the door then tighten the hinge bracketscrews.

To adjust up or down, remove the door and add orremove washers from the lower hinge pin. Reinstalldoor and check for correct clearances.

9.5 AMBIENT TEMPERATUREThis is the temperature surrounding the recreationalvehicle, as well as the temperature of air at the back ofthe refrigerator. As the ambient temperature increases,the air temperature in the area of the cooling unitincreases. The RM7030 and RM7732 will maintainapproximately 43 degrees food storage temperature at110 degree ambient temperature. As the ambienttemperature increases, it is possible for the interiortemperature of the refrigerator to increase. This meansproper installation, ventilation and leveling are importantfor proper operating temperature of the refrigerator.

9.6 COOLING UNITThe cooling unit is a self-contained, hermetically sealedset of coils where the refrigeration process takes place.The chemicals involved in the cooling process includehydrogen, ammonia, water and a rust inhibiting agent.There are no repairs recommended on the cooling unit.If it is defective, replace with a new cooling unit.

To check the cooling unit, first verify the AC heatingelements are good (see Sec. 3). Then place approxi-mately one gallon of water inside the refrigerator and

place a thermometer in one of the containers of water.Next, supply 115 volts directly to the AC heating ele-ments and operate for at least 12 hours. Then checkthe temperature on the thermometer. It should be at 45degrees or lower depending on test conditions (seeSec. 9.2 and 9.5). If so, the cooling unit is good. If thetemperature of the water is above 45 degrees, replacethe cooling unit.

9.7 FOOD STORAGEProper refrigeration requires free air circulation withinthe food storage compartment. Restricted air circulationwithin the compartment will cause higher cabinettemperatures. To remedy this situation, simply rear-range your food items. It is also essential that theshelves are not covered with paper or large storagecontainers. Always remember to allow for proper aircirculation.

Odors or highly flavored foods should always be storedin covered dishes, plastic bags or wrapped in foil orwaxed paper to prevent food odors. Vegetables, lettuce,etc., should be covered to retain their crispness.NEVER PUT HOT FOOD INTO THE REFRIGERATOR.

To reduce frost formation in and on the freezing com-partment, cover stored liquids and moist foods and donot leave the door open longer than necessary.

When the refrigerator is heavily loaded, it takes longerto lower the refrigerator temperature, and longer tomake ice. A very heavy load may also cause defrosting.

9.8 HIGH HUMIDITYHigh humidity may cause a small amount of condensa-tion to form on the frame of the refrigerator. In extremecases, the condensation may actually run off the frame.As the humidity is reduced, the sweating will decrease.High humidity can also be a factor in rapid formation offrost.

The RM7030 and RM7732 refrigerators have climatecontrols installed (see Sec. 5.12). Use of the climatecontrol will reduce the formation of condensation on theframe.

SMOOTH FIT, PROPER SEAL

28



9.9 INTERIOR LINER SEAL TO FRAMEThere is a seal that is applied to the liner in the areawhere the metal frame makes contact with the interiorliner. If this seal is incomplete, cold air can migrate outto the metal frame. If this happens, condensation couldform on the frame and could promote rapid formation offrost. If you suspect an improper seal, apply a smallbead of silicone all the way around the perimeter wherethe frame meets the interior liner.

Remove all screws securing the refrigerator into thecabinet and slide the refrigerator out approximately 2�4inches. Clean the metal frame and foil-backed insulationaround the refrigerator. Apply a foil-backed adhesivetape to the joint between outer frame and foil-backedrefrigerator insulation. Refer to illustration top of page22.

Make sure the refrigerator is dry and that the surfacetemperatures are above 50°F. Use a clear siliconcaulking compound and seal the seam between therefrigerator's plastic liner and the metal frame. Apply thesilicon in a continuous bead around both the refrigeratorfreezer and food compartments.

NOTE: TO FORM A PROPER SEAL, IT IS IMPOR-TANT NOT TO LEAVE ANY GAPS.

(Section 10. Icemaker Operation, continue to Page 29)

29


Refrigerators

SECTION 10

ICE MAKER OPERATION

The refrigerator must be allowed to precool properlybefore starting the ice maker. The refrigerator has to beconnected to 120 volts AC before the ice maker canoperate. The water line manual shutoff valve must beopen. To start making ice, move the ice level bail arm toDOWN position.

When the ice maker thermostat senses the presettemperature for ejection of the ice cubes, the fingers willstart to rotate � dumping any ice cubes and filling themold with water.

When the storage container is full of ice, the ice levelbail arm can not return to the DOWN position. This willstop further production of ice until the container isemptied and the bail arm is returned to the downposition.

The absorption system will keep the compartment at theproper temperature for storage of ice. Ice making isaccelerated if the thermostat is set to the coldestposition. It is a good idea to do this a few hours beforeyou anticipate a need for ice.

NOTE: IF THE ICE MAKER WAS CLEANED ANDDRAINED, NO ICE CUBES WILL BE DUMPED INTOTHE STORAGE CONTAINER DURING THE FIRSTCYCLE.

The first few cycles may have small cubes due to airtrapped in the water lines. The first container of icecubes should be dumped if the water system has beenwinterized or not used for several weeks.

DOWN POSITION

ICE LEVELBAIL ARM

SECTION 11

ICE MAKER COMPONENTS11.1 MOLD HEATERThe mold heater uses 165 watts to thaw the ice freefrom the mold. It is wired in series with the thermostatwhich also acts as asafety device. Withpower to the appli-ance off, check forresistance be-tween the twoleads to theheater element.You should obtaina reading ofapproximately 80 ohms. If the heater is found to bedefective, the manufacturer recommends replacementof the entire ice making unit for proper operation.

11.2 ICE EJECTORThe ice ejector blades sweepthe ice from the moldcavities during theejection cycle.

The drive end of theejector is "D" shapedfor positive coupling.The bearings at bothends are lubricatedwith silicone grease. If the ejector blades are frozen intothe ice, defrost the ice maker and manually cycle the icemaking unit, making sure the ejector stops at the rightlocation.

11.3 MOLD THERMOSTATThis is a single-pole, single-throw, bimetal switch. Itstarts an ejection cycle by closing at 18ºF ± 5º. Thereset temperature is 50ºF ± 5º. The thermostat is inseries with the mold heater and acts as a safety againstoverheating in case of a mechanical failure. If thethermostat is defective, replace it.

MOLD HEATER(Staked in Place)

"D" SHAPEDDRIVE END

CLAMP

THERMOSTAT

30



11.4 SHUTOFF ARMThe shutoff arm is cam driven. It operates a switch tocontrol the quantity of ice produced. During the ejectioncycle the arm is raised and lowered during each of thetwo revolutions of the timing cam. If the shutoff armcomes to rest on top of the ice in the storage bin duringeither revolution, the switch will remain open and stopthe ice maker at the end of that revolution. The arm hasa manual shutoff built into the linkage; by raising thearm as high as possible, it will lock in that position untilforced down.

If the arm and switch do not operate properly, check fordamage and repair or replace parts as necessary.

11.5 MOLD SWITCHESThese three switches are single-pole, double-throwstyle. They are identical and interchangeable.The holding switch assures completion of a revolutiononce a cycle has started.The water valve switch opens the water valve duringthe fill stage of the cycle. NOTE: This is the only adjust-able component of the ice maker. If you use a double-throw switch, DO NOT use the N.O. terminal.The shutoff switch stops the ice maker's operationwhen the storage bin is full.

ARM DOWNICE MAKERWILL OPERATE

ARM UPSTOPSOPERATION

ShutoffSWITCH

LEVERARM

FRONT VIEWMOTOR

MOUNTINGPLATE

TIMING CAM

WATERVALVESWITCH

HOLDINGSWITCH

11.6 TIMING MOTORThis is a low-wattage, stall-type motor which is gearedto the timing cam and ice ejector. It is a one RPMmotor.

To check the motor, disconnect power to the applianceand test for continuity between the two leads. If you DONOT have continuity, replace the motor. If you havecontinuity and the motor runs, DO NOT replace.

11.7 WATER VALVEThis valve is solenoid operated. When it is open, itreleases water from the source to the mold. The amountof water is proportional to the length of time the watervalve switch is held closed by its timing cam.

Disconnect power to the appliance, remove the wires tothe water valve solenoid coil, and check for continuitybetween the two terminals. If you have continuity, thesolenoid is good. It takes 10-15 watts to energize thesolenoid coil. The mold heater and coil are in series.When the mold heater is activated, this causes thevoltage to drop to about 105 VAC at the coil.

The valve has a flow washer inside which acts as apressure regulator. A strainer is installed to prevent dirt,rust, etc. from entering the valve. Check for any debriswhich might obstruct the flow of water, or prevent thevalve from closing completely when the circuit is notenergized. Remove any obstructions. If the valve stillfails to operate properly, replace it.

VALVE BODY

WATER VALVE

STRAINER

FLOWWASHER

SOLENOIDCOIL

31


Refrigerators

11.8 ICE MAKER ASSEMBLYIt may be necessary to replace the entire ice makerassembly.

Disconnect power to the appliance. Disconnect theleads inside the ice maker unit. Check each wire forcontinuity to make sure the wiring is good beforereplacing the ice maker unit. If there is no continuity onany of these wires, replace or repair them as necessaryand recheck the ice maker unit to determine whetherthe problem was in the wiring or the unit itself.

OPERATIONWhile the operation of the ice maker is fairly simple, anunderstanding of its cycle is necessary for the servicetechnician to diagnose specific problems.

The following series of electrical schematics (on thefollowing pages) will show a typical cycle, and thepositions of various components during the cycle: themold and its contents, the ejector, the shutoff arm andthe storage bin.

NOTE: If you have difficulty in reading schematics andcircuit diagrams, please enroll in a basic electricalcourse at your local school or college.

(SCHEMATICS CONTINUED ON PAGES 32 THROUGH 34)

32



33


Refrigerators

34



SECTION 12

ICE MAKER � OTHER12.1 WATER FILL ADJUSTMENTThe correct water level in the mold is important for theproper production of ice. The size of the ice cubesdepends on the amount of water which enters the mold.The cubes should be approximately 1/2" wide, 3/4" highand 2-1/2" long. If the water overflows in the mold, first check to see ifthe ice maker unit is level in the appliance. Next ensurethat the appliance is installed level in the RV.

If there is still water overflow, adjustment of the water fillscrew is necessary. Locate the screw on the ice makerassembly. Turn the screw as necessary toward the "+"or "�" side. One full turn of the screw will make an 18ccchange in the amount of water. DO NOT turn the screwmore than one full turn at a time.

If the water level is too high, it can also cause theejector blades to become frozen in the ice. Follow theprocedures above to correct the problem.

WATER FILL ADJUSTING SCREW1 FULL TURN = 18 cc's CHANGE

35


Refrigerators

12.2 WIRINGRefer to the wiring diagram supplied with the unit you are working on, and make sure all wiring connections arecorrect and tight.

THIS IS AN ENERGIZED CIRCUIT. ELECTRICAL SHOCK CAN OCCUR.BEFORE CHECKING THESE COMPONENTS BE SURE THERE IS NO POWER TO THE APPLIANCE.

ICE MAKER TYPICAL WIRING DIAGRAM

12.3 WATER SUPPLYTo operate properly, the water pressure in the watersupply line must be between 15 lbs. PSI and 125 lbs.PSI.

Lower water pressure, water turned off, or obstructionsor air in the water line can cause low or no ice produc-tion.

First check to see that the water supply is fully turnedon. Visually check the line for kinks, etc. which mightobstruct the flow of water.

To remove trapped air, loosen the connection at thewater solenoid valve of the appliance. Ensure thatpressurized water is reaching this point, and bleed offany air in the line. Retighten the connection, makingsure there are no leaks.

Dometic Rm7030/Rm7732 Refrigerators Service Manual...Foreword This service manual is the result of...

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