MFL48178827LG Studio Series

REFRIGERATORSERVICE MANUALCAUTIONBEFORE SERVICING THE UNIT,READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

MODEL : LSMX214ST COLOR : STAINLESS(ST)SMOOTH BLACKSUPER WHITE

CONTENTS

- 2 -

SAFETY PRECAUTIONS ....................................................................................................................................................... 21. SPECIFICATIONS .............................................................................................................................................................. 32. PARTS IDENTIFICATION .................................................................................................................................................. 43. DISASSEMBLY ............................................................................................................................................................. 5-16

REMOVING AND REPLACING REFRIGERATOR DOORS .............................................................................................. 5DOOR .............................................................................................................................................................................. 6-7DOOR ALIGNMENT ........................................................................................................................................................... 7FAN AND FAN MOTOR(Evaporator) ...............................................................................................................................7-8DEFROST CONTROL ASSEMBLY ................................................................................................................................... 8LAMP .................................................................................................................................................................................. 8MULTI DUCT ...................................................................................................................................................................... 9MAIN PWB, DISPENSER, DISPLAY PCB, ICE BUTTON ASSEMBLY, FUNNEL REPLACEMENT ................................. 9WATER BUTTON ASSMEBLY, CAP DUCT MOTOR REPLACEMENT, ICE CORNER DOOR REPLACEMENT ........................................................................................................................... 10ICEMAKER ASSEMBLY, AUGER MOTOR COVER ....................................................................................................... 11HOW TO REMOVE A DOOR ICE BIN, HOW TO INSERT A DOOR ICE BIN ................................................................. 12HOW TO REMOVE AND REINSTALL THE PULLOUT DRAWER ............................................................................. 13-14WATER VALVE DISASSEMBLY METHOD, FAN AND FAN MOTOR DISASSEMBLY METHOD .................................. 15TOP DRAWER, BOTTOM DRAWER ............................................................................................................................... 16

4. ADJUSTMENT ............................................................................................................................................................ 17-18COMPRESSOR ................................................................................................................................................................ 17PTC-STARTER ................................................................................................................................................................ 17OLP(OVERLOAD PROTECTOR) ..................................................................................................................................... 18TO REMOVE THE COVER PTC ...................................................................................................................................... 18

5. CIRCUIT DIAGRAM ......................................................................................................................................................... 196. TROUBLESHOOTING ................................................................................................................................................ 20-24

COMPRESSOR AND ELECTRIC COMPONENTS .......................................................................................................... 20TSD AND OLP .................................................................................................................................................................. 21SERVICE DIAGNOSIS CHART ....................................................................................................................................... 22REFRIGERATION CYCLE .......................................................................................................................................... 23-24

7. OPERATION PRINCIPLE & REPAIR METHOD OF ICEMAKER .............................................................................. 25-278. DESCRIPTION OF FUNCTION, CIRCUITS & ERROR CODES ................................................................................ 28-449. EXPLODED VIEW & REPLACEMENT PARTS LIST ..................................................................................................... 45-

SAFETY PRECAUTIONS

Please read the following instructions before servicing yourrefrigerator.1. Unplug the power before handling any elctrical

componets.2. Check the rated current, voltage, and capacity.3. Take caution not to get water near any electrical

components.4. Use exact replacement parts.5. Remove any objects from the top prior to tilting the

product.

1. SPECIFICATIONS

- 3 -

Opaque Drawer Type

Linear

Fin Tube Type

Spiral Condenser

R-134a (140g)

ISO10 (280 ml)

SHEATH HEATER

LED Module(27)

LED Module(9)

VEGETABLE TRAY

COMPRESSOR

EVAPORATOR

CONDENSER

REFRIGERANT

LUBRICATING OIL

DEFROSTING DEVICE

REFRIGERATOR

FREEZERLAMP

ITEMS SPECIFICATIONS

Side Rounded

35 3/4 X 30 X 69 3/4 (WXDXH) 21cu.ft

324.18 (21cu.ft)

Fan Cooling

Micom Control

Full Automatic

Heater Defrost

Embossed Metal, VCM, Stainless

Bar

ABS Resin

Polyurethane Foam

DOOR DESIGN

DIMENSIONS (inches)

NET WEIGHT (pounds)

COOLING SYSTEM

TEMPERATURE CONTROL

DEFROSTING SYSTEM

DOOR FINISH

HANDLE TYPE

INNER CASE

INSULATION

ITEMS SPECIFICATIONS

Description LSMX214ST

Depth w/ Handles

Depth w/o Handles

Depth w/o Door

Depth (Total with Door Open)

Height to Top of Case

Height to Top of Door Hinge

Width

Width (door open 90 deg. w/o handle)

Width (door open 90 deg. w/ handle)

A

B

C

D

E

F

G

H

I

30.

27 1/2 in.

23 5/8 in.

42 1/4 in.

68 3/8 in.

69 3/4 in.

35 3/4 in.

39 1/4 in.

44 1/4 in.

DIMENSIONS

21 cu. ft

2. PARTS IDENTIFICATION

- 4 -

ADJUSTABLE REFRIGERATOR SHELVINGThe refrigerator compartment shelves are adjustable toallow flexibility for storage needs.MODULAR DOOR BINSThree interchangeable bins can be arranged to suit yourstorage needs.REMOVABLE ICE STORAGE BINThe ice storage bin can be removed to fill icebuckets,coolers,or pitchers.INTERIOR LAMPSTwo separate LED arrays light the freezer and refrigeratorinteriors.CAN STORAGE BINFIXED DOOR BININTERIOR LAMP

1

2

3

4

5

6

7

Removing Refrigerator DoorCAUTION : Before you begin, unplug the refrigerator. Remove food and bins from doors.Left Door -FIG. 2

1. Disconnect water supply tube by pushing back on the disconnect ring (4).-FIG. 12. Open door. Loosen top hinge cover screw (1).

Use flat tip screwdriver to pry back hooks on front underside of cover (2). Lift up cover.3. Disconnect door switch wire harness. Remove cover.4. Pull out the tube(3).5. Disconnect the three wire harnesses (4). Remove the grounding screw (5).6. Rotate hinge lever (6) counterclockwise. Lift top hinge (7) free of hinge lever latch (8).

CAUTION : When lifting hinge free of latch, be careful that door does not fall forward.7. Place door, inside facing up, down onto a non-scratching surface.

Right Door -FIG. 31. Open door. Loosen top hinge cover screw (1). Lift up cover (2).2. Disconnect door switch wire harness. Remove cover.3. Disconnect wire harness (3).4. Remove the grounding screw (4).4. Rotate hinge lever (5) clockwise. Lift top hinge (6) free of hinge lever latch (7).

CAUTION : When lifting hinge free of latch, be careful that door does not fall forward.5. Lift door up from middle hinge pin door.6. Place door, inside facing up, down onto a non-scratching surface.

3. DISASSEMBLY

- 5 -

3-1 REMOVING AND REPLACING REFRIGERATOR DOORS

(4)

(5)(6)

(7)

(3)

Figure 1

Figure 2 Figure 3

1)Insert the tube until you can see only one of the linesprinted on the tube.

2)After inserting, pull the tube to ascertain that it is secure.3)Assemble clip.

- 6 -

3-2 DOOR

Door Gasket Removal1. Remove door frame cover

Starting at top of cover and working down, snap coverout and away from door.

Door Gasket Replacement1. Insert gasket bracket clips

1) Insert gasket bracket edge beneath door frame edge.2) Turn upper gasket bracket spring so that the spring

ends are in the door channel.3) Push in clip until you hear it snap securely into place.

2. Insert gasket into channel1) Snap gasket assembly into the door bracket.<Inserting the Gasket Assembly into the Bracket Door>

4) Push in remaining clip until you hear it snap securelyinto place.

Note : Make sure that no part of gasket bracket edgeprotrudes from beneath door frame edge.

2. Remove gasket bracket clipsThere are two clips on each door. Start bracket removalnear one of the middle clips.1)Pull gasket back to expose gasket bracket clip and

door frame.2)Insert a flat tip screwdriver into seam between gasket

bracket and door frame and pry back until clips snapout.

3)Continue prying back along seam until all clips snapout.

3. Remove gasketPull gasket free from gasket channel on the threeremaining sides of door.

Figure 1

Frame Cover

Handle

Figure 4

Figure 5

DoorFrame

Correct

Correct

Incorrect

Incorrect

Figure 2

DoorFrame

GasketBracket Clip

GasketBracket

Flat TipScrewdriver

Figure 3

Spring

GasketBracket Clip

- 7 -

3. Replace door frame coverStarting at top of cover and working down, snap coverback into door.

2) Press gasket into channels on the three remaining sidesof door.

Figure 6

Figure 8

Figure 9

Figure 7

3-3 DOOR ALIGNMENT

If the space between your doors is uneven, follow theinstructions below to align the doors:1. Remove the Base Grillie.2. Turn the leveling legs (CCW) to raise or (CW) to lower

the height of the front of the refrigerator by using flatblade screw driver or 11/32" wrench.

3. Use the wrench (Included with the User Manual) toadjust the bolt in the door hinge to adjust the height.(CCW to raise or CW to lower the height.)

3-4 FAN AND FAN MOTOR(EVAPORATOR)

1. Remove the freezer shelf. (If your refrigerator has anicemaker, remove the icemaker first)

2. Remove the plastic guide for slides on left side byunscrewing phillips head screws.

3. Remove the grille by removing one screw and pulling thegrille forward.

4. Remove the Fan Motor assembly by loosening 2 screwsand disassembling the shroud.

5. Pull out the fan and separate the Fan Motor and Bracket.

BRACKETMOTOR

GRILLE

FAN

FAN MOTOR

CAUTIONDO NOT ATTEMPT TO REMOVE THE MULLION :

REFRIGERANT LINES!

- 8 -

* Ice Fan Scroll Assembly Replacement

1) Remove the plastic guide for slides on left side byunscrewing phillips head screws.

2) Pull the grille forward as shown in the second picture.3) Disconnect wire harness of the grille.4) Remove the scroll assembly by loosening all screws.

(3) (4)

Figure 12

Figure 13

Figure 15

Figure 14

3-5 DEFROST CONTROL ASSEMBLYDefrost Control assembly consists of Defrost Sensor andFUSE-M.The Defrost Sensor works to defrost automatically. It isattached to the metal side of the Evaporator and senses itstemperature. At 46°F (8°C), it turns the Defrost Heater off.Fuse-M is a safety device for preventing over-heating of theHeater when defrosting.1. Pull out the grille assembly. (Figure 10)2. Separate the connector with the Defrost Control

assembly and replace the Defrost Control assembly aftercutting the Tie Wrap. (Figure 11)

Figure 10 Figure 11

GRILLE ASSEMBLY DEFROST-CONTROLASSEMBLY

Cover, Lamp LED, Assembly Case Lamp

3-6 LAMPUnplug Refrigerator, or disconnect power at the circuitbreaker.If necessary, remove top shelf or shelves.

1) Release 2 screws.2) Hold both ends with your both hands and pull it

downward to remove it.

3) Use a flat tool as shown below to remove the coverlamp.

3-6-1 Refrigerator Compartment Lamp

1. Unplug refrigerator power cord form outlet.2. Remove screw with driver.3. Grasp the cover Lamp,pull the cover downward.

3-6-2 Freezer Compartment Lamp

(1) (2)

CAUTIONDO NOT ATTEMPT TO REMOVE THE MULLION :

REFRIGERANT LINES!

4) As shown below, use a flat tool to remove the coverlamp.

- 9 -

3-7 MULTI DUCT

1. Remove the upper andlower Caps by using aflat screwdriver, andremove 2 screws.(Figure 16)

2. Disconnect the lead wireon the bottom position.

3-8 MAIN PWB

1) Loosen the 3 screws on the PWB cover.

Figure 16

3-9 DISPENSER

1) Pull out the darin 2) Hold the inner side ofcover dispenser with bothhands at the handle sideto pull it out forward.

2) Remove the PWB cover

3) Disconnect wire harness and replace the main PWB inthe reverse order of removal.

CAUTION : When replacing the dispensor cover in thereverse order of removal, be careful that the lead wiredoes not come out and the water tube is not pinched bythe dispensor,

3) If nozzle is interfered with button ,push and pull out the bottom ofbutton.

4) Rmove theconnected partof Lead wire.

3-10 DISPLAY PCB

As shown below, remove 1 case PCB fixing screw.Remove the display PCB fixing screw.

3-11 ICE BUTTON ASSEMBLY

1) Remove the screw fixing the button lever.2) Push the spring from the hanging hook to remove it.3) Apply some pressure to the rib in direction and lift the

button in direction.

3-12 FUNNEL REPLACEMENT

Pull down and forward.

Case, PCB Display PCB

Button Lever

- 10 -

3-15 ICE CORNER DOOR REPLACEMENT

1) Loosen the front screw as shown in the picture.2) Lift up the hinge with one hand.3) Pull out the Ice Corner Door with the other hand.

3-13 WATER BUTTON ASSMEBLY

1) Romove screws.2) Grasp the Button assembly and lift up.

Button Lever

3-14 CAP DUCT MOTOR REPLACEMENT

1) Separate the Housing of the Cap Duct Motor.

2) Unscrew 3 screws to disassemble the motor.

3) When replacing to a new Motor, always hold the DuctDoor with your hand to install the Motor.

4) Assemble on the screws.

5) Contract the Housing.

Cap Duct Motor

Duct Door

- 11 -

3-16 ICEMAKER ASSEMBLY

1) Loosen two screws as shown in the first picture.

2) Disconnect the wire harness & ground screw replacetheIcemaker assembly in the reverse order of removal.

3) It separates a ground connection screw.

3-17 AUGER MOTOR COVER

1) After removing the icemaker remove the (5) stainlessscrews holding the auger motor cover, shown in thepicutres below.

2) Grip the bottom of motor cover assembly and pull out it.

3) Disconnect wire harness of motor cover assembly.There is a auger motor on the back, as shown in thepicture.

Auger Motor

Icemaker Power & Full detection Signal

- 12 -

3-20 HOW TO REMOVE A DOOR ICE BIN

1) Grip the handles, as shown in the picture.

3-21 HOW TO INSERT A DOOR ICE BIN

1) Insert the Ice Bin, slightly tilting it to avoid touching theIcemaker. (especially, ice maker lever)

Insert the ice bucket carefully avoid contacting theautomatic shut off arm.

2) Lift the lower part slightly.

3) Take the Ice Bin out slowly.

- 13 -

3-22 HOW TO REMOVE AND REINSTALL THE PULLOUT DRAWER

3-22-1 Follow Steps to Remove

Step 1) Open the freezer door. Step 2) Remove the lower basket.

Step 3) Remove the two screws from the guide rails (onefrom each side).

Step 5) First: Remove the gear from the left side first by releasing the tab behind the gear, place a screwdriver between thegear and the tab and pull up on the gear.

Second: Remove the center rail.

Third: Remove the gear from the right side by following the same steps for the left side.

NOTE : THIS TAB MUST BE PUSHED IN TO RELEASE THE GEAR.

Step 4) Lift the freezer door up to unhook it from the railsupport and remove.Pull both rails to full extension.

- 14 -

3-22-2 Follow Steps to Reinstall

Step 1) Reinstall the right side gear into the clip.

Step 2) Insert the rail into the right side gear. Gears do notneed to be perpendicular to each other.

Step 4) The rail system will align itself by pushing the railsall the way into the freezer section.Pull the rails back out to full extension.

Step 5) Reinstall the freezer door by inserting the rail tabsinto the guide rail.

Step 6) Reinstall the two screws into the guide rails(one from each side).

Step 7) Reinstall the lower basket, and close the freezerdoor.

Step 3) Insert the rail into the left side gear, and insert thegear into the clip.

- 15 -

3-23 WATER VALVE DISASSEMBLY METHOD

1) Turn off the water. Then separate the water line from thevalve.

3-24 FAN AND FAN MOTOR DISASSEMBLYMETHOD

1) Using a short screwdriver, loosen one SCREW in DRAINPIPE ASSEMBLY and one connected to the MOTORCOVER.

2) Separate the Mechanical Cover and Valve Screw.

3) Separate the housing and pull out the valve.

4) Lay a dry towel on the floor and get ready to spill waterfrom the water filter. Pull out the Cilp. Then press tecollet to separate the tube from the connector and pourout the water until emptied.

Mechanical Cover

Housing

MOTOR COVER

2) Pull and separate the FAN ASSEMBLY and MOTORturning counterclockwise based on the MOTOR SHAFT.

The assembly is in the reverse order of the disassemblyand take special care for the following details.1. Be careful not to bend the tube during assembly.2. Press the WATER DISPENSER button until water pours

out and check for leakage in the CONNECTOR TUBE (Itdiffers by the water pressure but usually takes about 2minutes until water pours out.)

FAN ASSEMBLY MOTOR

Collet

Tube

Insert Line

Clip

- 16 -

3-25 TOP DRAWER

To remove the freezer drawer, pull the drawer open to full extension. Remove the drawer and Ice Bin lifting the basket fromthe rail system.

3-26 BOTTOM DRAWER

To remove the freezer drawer, pull the drawer open to full extension. Remove the lower DuraBase ®basket by lifting thebasket from the rail system.

4. ADJUSTMENT

- 17 -

4-1-1 Role

4-1 COMPRESSOR

The compressor intakes low temperature and low pressuregas from the evaporator of the refrigerator and compressesthis gas to high-temperature and high-pressure gas. It thendelivers the gas to the condenser.

4-1-2 Note for Usage

(1) Be careful not to allow over-voltage and over-current.(2) Do not drop or handle carelessly.(3) Keep away from any liquid.

If liquid such as oil or water enters the Cover PTCCompressor may fail due to breakdown of theirinsulating capabilities.

(4) Always use the Parts designed for the compressor andmake sure it is properly attached to the compressor.Parts may appear physically identical but could havedifferent electrical ratings. Replace parts by part numberand model number. Use only approved substitute parts.

4-1-3 Remove the cover PTC

(1) Remove the Cover Back M/C

(2) Loosen two screws on comp base

(3) Use a L-shaped flap tooll to pry off the cover(4) Assembly in reverse order of disassembly

4-2-3 Compressor protection logicSince linear Comp conducts linear reciprocating motion,we have protection logic for compressor, motor and PCBas the below.

- Stroke TripDuring the operation, if stroke is above the target value,decrease the target volt by 3V.

- Current TripCurrent trip is set in order to protect compressormechanical part and drive from the overcurrent that mightarise during the operation.Check the current for every 416.7us and if the Tripexceeds 1.86Arms more than three times at Comp ON,forcibly stop and restart six minutes later.

- Lock Piston TripIf stroke is under 5mm even if the current is more than14Arms, Take it as ‘piston lock’ and restart after 2’30” ofComp OFF. Check the current and stroke for every416.7us and if the condition fits more than three times atComp ON, the Trip occurs.

- IPM fault TripIt occurs if FO signal received from IPM is LOW. Forevery 416.7us, check whether FO signal is LOW. The tripoccurs if it is found three times during the fiveperiods(83ms).

- 18 -

5. CIRCUIT DIAGRAM

FZ

FZ

- 19 -

6. TROUBLESHOOTING

NOError Detection

Category

1 Normality None Normal operation of Display

2Freezer Sensor

Error Er FSShort or Disconnection ofFreezer Sensor

3RefrigeratorSensor Error Er rS

Short or Disconnection ofRefrigerator Sensor Each Sensor have to check

disconnection

Error Generation Factors Remark

Error Display

FreezerTemperature

Ref.Temperature

4Defrosting Sensor

Error Er dSShort or Disconnection ofDefrosting Sensor

5 Icing Sensor Error Er ISShort or Disconnection ofIcing Sensor

6 Poor Defrosting Er dH

Even though it is passed1hour since then Defrosting,if Defrosting sensor is notover 46°F(8°C), it is caused

Temperature FuseDisconnection, Heaterdisconnection, DRAIN Jam,Poor Relay for Heater

7

Abnormality ofBrushless DC

FAN Motor for IceMaking

Er IF

It is caused when F/B signalisn’t over 65 seconds duringBrushless DC FAN motoroperating

Poor BLDC Motor connection,DRIVE IC, and TR

8

Abnormality ofBrushless DCFAN Motor for

Freezer

Er FF

It is caused when F/B signalisn’t over 65seconds duringBrushless DC FAN motoroperating


9

Abnormality ofBrushless DCFAN Motor for

Mechanic Room

Er CF

It is caused when F/B signalisn’t over 65seconds duringBrushless DC FAN motoroperating


10 CommunicationError

Er COCommunication Errorbetween Micom of Main PCBand Display Micom

Poor Communicationconnection, Poor TR ofTransmitter and Receiver

ERROR CODE on display panel

NOTE) In the case of Room Temperature Seneor Error, “Er rt” appears on the Display when ICE PLUS KEY and Freezer Temp’ KEY pressed at the same time for one second.

NOTE) 3 hours befor the error : Press the ICE PLUS button and Freezer button simultaneously 3 hours after the error : All errors, except for “Er rt” error, are displayed.

- 20 -

7. PCB Picture

7-1 Main PCB

P/No & MFG

EBR67348016(2011.01~)

Picture

CON4

CON5

CON8

CON3

CON2

CON1

- 21 -

CON2

7-2 Display PCB & Sub PCB

P/No

Display PCBEBR42478905

(2010.02~)

Sub PCBEBR60070708

(2010.02~)

Picture

CON3 CON1

CON103 CON104

CON102

CON101

- 22 -

8. TROUBLESHOOTING WITH ERROR DISPLAY

0

Infiniteohms

Seeresistance

table

Short

Open

Normal

Change the sensor

Replace therefrigerator

Check the Temp andresistance (Table-1)

Result SVC Action

8-1 Freezer Sensor Error (Er FS)

No

1

2

Checking flow

Check for a loose connection.

Check the Blue/White to Blue/White.

Result & SVC Action

<CON4> <Temperature table-1>

(1) To (2)

-22°F / -30°C

-13°F / -25°C

-4°F / -20°C

5°F / -15°C

14°F / -10°C

23°F / -5°C

32°F / 0°C

Result

40

30

23

17

13

10

8

The sensor is determined by the temperature.For example, 23 indicates -4°F.

- 23 -

8-2 Refrigerator Sensor Error (Er rS)

No

1

2

Checking flow


Check the White to White.

Result & SVC Action

<Temperature table-2>

(1) To (2)

23°F / -5°C

32°F / 0°C

41°F / 5°C

50°F / 10°C

59°F / 15°C

Result

38

30

24

19.5

16

The sensor is determined by the temperature.For example, 30 indicates 32°F.

<CON4>

0

Infiniteohms

Seeresistance

table

Short

Open

Normal

Change the sensor



Result SVC Action

- 24 -

8-3 Icing Sensor Error (Er IS)

No

1

2

Checking flow


Check the Blue to Blue.

Result & SVC Action


(1) To (2)

-22°F / -30°C

-13°F / -25°C

-4°F / -20°C

5°F / -15°C

14°F / -10°C

23°F / -5°C

32°F / 0°C

Result

40

30

23

17

13

10

8


<CON101>

<Display>

<CON101>0

Infiniteohms

Seeresistance

table

Short

Open

Normal

Change the sensor

Check the resistanceof the defrost sensor

wires back to themain PCB. If they are

open between theMain PCB and theconnector for theicemaker it will be

necessary to replacethe refrigerator.


Result SVC Action

- 25 -


(1) To (2)

-22°F / -30°C

-13°F / -25°C

-4°F / -20°C

5°F / -15°C

14°F / -10°C

23°F / -5°C

32°F / 0°C

Result

40

30

23

17

13

10

8

8-4 Defrost Sensor Error (Er dS)

No

1

2

Checking flow


Check the Orange to Orange.

Result & SVC Action

Check the Brown to Brown.

<CON4>


0

Infiniteohms

Seeresistance

table

Short

Open

Normal

Change the sensor



Result SVC Action

- 26 -

8-5 Defrost Heater Error (Er dH)

No

1

2

Checking flow

Check the Door gasket.

Check the Defrost control part.

3 Input Test 3 Mode.(Push the button 3 times)

4 Check the Blue to Orange.

Result & SVC Action

FuseM

Defrost Heater

DefrostSensor

5 Release the test mode. Push the button 1 times. (Normal)

<CON3>

Result

112 ~ 116 V

0 V

SVC Action

Go to the 5

Replace Main PCB

6 Check the Blue to Orange.

Result

0 V

112 ~ 116 V

SVC Action

Normal

Replace Main PCB

Fuse-M

DefrostHeater

DefrostSensor

0

34~42

0

Infiniteohms

Go to the 3

Change Fuse-M

Go to the 3

Change Fuse-M

Go to the 3

Check the resistance ofthe defrost sensor wiresback to the main PCB.

If they are openbetween the Main PCBand the connector forthe icemaker it will benecessary to replace

the refrigerator.

Part Result SVC Action

- 27 -

8-6 Freezer Fan Error (Er FF)

No

1

2

Checking flow

Reset the unit and Input Test 1 Mode.(Push the button 1 time)

Open the freezer door and Check the airflow.

While an error code is displayed,the fan is not working.

3 Check the Fan motor. Rotate fan using your hand.It feel stuck or locked up, change the motor.(Cause of ice or rust inside of motor)

4 Check the Fan motor voltage.

Result & SVC Action

Below 12 V

0 or 5 V

(1) ~ (2)

(2) ~ (3)

Change the PCB

Change the motor

Point Result SVC Action

<CON4>

Status

No airflow

Airflow

SVC Action

Go to 3

Go to 4

(1)

(2)

(3)

- 28 -

8-7 Icing Fan Error (Er IF)

No

1

2

Checking flow


Open the refrigerator door and Check theair flow.


3 Check the Connector.(Frozen caused the PCB short)

TipTo protect ice short, add wire seal inconnector. We developed new typeconnector, so order the new type.

4 Check the Fan motor.(Frozen, Lock, ect.)

Result & SVC Action


Below 9 V

0 or 5 V

(1) ~ (2)

(2) ~ (3)

Change the PCB

Change the motor

Result SVC Action

Duct Asm,

Connector407A

ADJ7291

1301

ADJ7291

1301

Part Name Old P/No New P/NoNo

Status

No airflow

Airflow

SVC Action

Go to the 3,4

Go to the 5

Wire seal (Silicon)

<CON4>(1)

(2)

(3)

- 29 -

8-8 Condenser Fan Error (Er CF)

No

1

2

Checking flow


Check the fan rotating.


3 Check the Fan motor and surrounding. Rotate fan using your hand.It feel stuck or locked up, change the motor.

Result & SVC Action


Below 10 V

0 or 5 V

(1) ~ (2)

(2) ~ (3)

Change the PCB

Change the motor

Result SVC Action

Status

No airflow

Airflow

SVC Action

Check motor

Go to the 4

<CON4>

(1) (2) (3)

- 30 -

8-9 Communication Error (Er CO)

No

1

2

Checking flow

Check the loose connection.

Check the Red to White/Red.

Result & SVC Action

Result

12 V

Other

SVC Action

Go to the 3

Check the Hinge (loose connection)

Change the Main PCB

5 Check the White/Red to Orange.

<CON5>

6 Check the White/Red to White/Black.

<CON5>

<CON101><Display>

CON0101

3 Check the Orange to White/Red.Result

0 V or 5 V

Other

SVC Action

Change the Display PCB

Go to the 4

4 Check the White/Black to White/Red.Result

0 V or 5 V

Other

SVC Action

Change the Main PCB

Go to the 5

Result

0 V or 5 V

Other

SVC Action

Change the Display PCB

Go to the 6

Result

0 V or 5 V

Other

SVC Action

Change the Main PCB

Normal

CON0101

CON0101

<CON101><Display>

<CON101><Display>

9. TROUBLESHOOTING WITHOUT ERROR DISPLAY

- 31 -

9-1 Cube mode doesn’t work

No

1

2

Checking flow


Check the Black to Blue.(While pushing the lever S/W)

Result & SVC Action

<CON2>

3 Check the Red to Blue.(While pushing the lever S/W)

4 Check the resistance value.

<Ice Maker>

<Geared Motor> <Dispenser Solenoid>

(2)(1)

(3) (4)

Activated

Notactivated

112 ~ 115 V

Other

0 ~ 2 V

Other

Go to the 3

Change PCB

Go to the 3

Change PCB

Lever s/w Result SVC Action

Activated

Notactivated

112 ~ 115 V

Other

0 ~ 2 V

Other

Go to the 4

Change PCB

Go to the 4

Change PCB


(1) to (2)

(3) to (4)

31.1 ~ 42.1

Other

44~54

Other

Normal

ReplaceGeared Motor

Normal

ReplaceDispenser Solenoid


<CON2>

- 32 -

9-2 Crush mode doesn’t work

No

1

2

Checking flow


Check the Black to Blue.(While pushing the lever S/W)

Result & SVC Action

<CON2>

3 Check the Red to Blue.(While pushing the lever S/W)


<Ice Maker>

<Geared Motor> <Dispenser Solenoid>

(2)(1)

(3) (4)

Activated

Notactivated

112 ~ 115 V

Other

0 ~ 2 V

Other

Go to the 3

Change PCB

Go to the 3

Change PCB


Activated

Notactivated

112 ~ 115 V

Other

0 ~ 2 V

Other

Go to the 4

Change PCB

Go to the 4

Change PCB


(1) to (2)

(3) to (4)

31.1 ~ 42.1

Other

44~54

Other

Normal

ReplaceGeared Motor

Normal

ReplaceDispenser Solenoid


<CON2>

- 33 -

9-3 Water mode doesn’t work

No

1

2

Checking flow


Check the Purple to Blue.(While pushing the lever S/W)

Result & SVC Action

3 Check the Blue to Gray.(While pushing the lever S/W)


<Pilot Valve>Machine Room

<Water Valve>In door

Activated

Notactivated

112 ~ 115 V

Other

0 ~ 2 V

Other

Go to the 3

Change PCB

Go to the 3

Change PCB


Activated

Notactivated

112 ~ 115 V

Other

0 ~ 2 V

Other

Go to the 4

Change PCB

Go to the 4

Change PCB


(1) to (2)

(3) to (4)

360 ~ 420

Other

360 ~ 420

Other

Normal

ReplaceWater Valve

Normal

ReplaceWater Valve

Point Result SVC Action(1) (2) (3) (4)

Dispenser Ice Maker

<CON3>

<CON2>

- 34 -

9-4 Freezer room AC Bulb Lamp doesn’t work

No

1

Checking flow

Check the Freezer door switch. If feel sticky, Change the door s/w.

Result & SVC Action

2 Check the door S/W resistance.

3 Check the Yellow Blue to Sky blue.

4 Check the Blue to Black. Check the Blue to Black.

Closed

Open

0 ~ 2 V

Other

115 V

Other

Normal

Change the Main PCB

Change the F Lamp

Change the PCB

Status Result SVC Action

Closed

Open

5 V

Other

0 V

Other

Go to the 4

Change the Door S/W

Go to the 4

Change the Door S/W


Normal

PushS/W

0

Other

Infinity

Go to the 3

Change door S/W

Go to the 3

Change door S/W


<CON4>

<CON3>

- 35 -

9-5 Refrigerator room lamp doesn’t work

No

1

Checking flow

Check the Refrigerator door switch. If feel sticky, Change the door s/w.

Result & SVC Action

2 Check the door S/W resistance.

3 Check the Black to Gray White.

4 Check the Red to Black.

Closed

Open

0 ~ 2 V

Other

12 V

Other

Normal

Change the Door S/W

Normal

Change the LED Lamp


Normal

PushS/W

0

Other

Infinity

Other

Go to the 3

Change door S/W

Go to the 3

Change door S/W


Normal12 V

Other

Go to the 4

Change the PCB


Normal12 V

Other

Go to the 5

Change the LED Lamp


5 Check the Black to White.

<CON4>

- 36 -

9-6 Poor cooling in Fresh food section

No

1

Checking flow

Check the sensor resistance.

2 Reset the unit and Input Test 1 Mode.(Push the button 1 time)

3 Open the fresh food door and Check the air flow.


Result & SVC Action

<CON4>

Temperature

23°F / -5°C

32°F / 0°C

41°F / 5°C

50°F / 10°C

59°F / 15°C

Result

38

30

24

19.5

16

Status

Airflow

No airflow

SVC Action

Go to the 4

Check the R Fan motorCheck the damper

(Go to the 6)

4 Check the air temperature.Cold or not?

Status

Cold

Not cold

SVC Action

Normal

Check the CompressorAnd sealed system

- 37 -

No

5

Checking flow

Damper checking method.Inputting TEST Mode, Check the damper and PCB.

6 Check the Fan motor.Rotate fan using your hand.It feel stuck or locked up, change themotor.(Cause of ice or rust inside of motor)

Result & SVC Action

7 Check the F Fan motor voltage.

(1)(3)

(2) (4)

Open

Closed

Notworking

1 Mode

2 Mode

1,2mode

Damper is normal.(Check the Damper)

Change the damper

TestMode

DamperState SVC Action

(1) to (2)

(3) to (4)

270 ~330

Other

270 ~330

Other

Normal

Change damper

Normal

Change damper

Test Point Result SVC Action

Below 12 V

0 or 5 V

(1) ~ (2)

(2) ~ (3)

Change the PCB

Change the motor


StuckMotor Change the motor


(1)

(2)

(3)

- 38 -

9-7 Poor cooling in Freezer compratment

No

1

Checking flow



3 Open the freezer door and check the airflow.


Result & SVC Action

Status

Airflow

No airflow

SVC Action

Go to the 4

Check the F Fan motor

4 Check the air temperature.Cold or not ?

Status

Cold

Not cold

SVC Action

Normal

Check the CompressorAnd sealed system

(1) To (2)

-22°F / -30°C

-13°F / -25°C

-4°F / -20°C

5°F / -15°C

14°F / -10°C

23°F / -5°C

32°F / 0°C

Result

40

30

23

17

13

10

8

<CON4>

- 39 -

(1) to (2)

(3) to (4)

270 ~330

Other

270 ~330

Other

Normal

Change damper

Normal

Change damper


9-8 Over cooling in Fresh food compartment

No

1

Checking flow



3 Open the refrigerator door and Check the air flow.


Result & SVC Action

Temperature

23°F / -5°C

32°F / 0°C

41°F / 5°C

50°F / 10°C

59°F / 15°C

Result

38

30

24

19.5

16

Status

Airflow

No airflow

SVC Action

Go to the 4

Check the R Fan Check the damper

(Go to the 5)

4 Input Test 2 Mode and Check the air flow.(Push the button 1 time)

5 Check the damper resistance.

Status

Airflow

No airflow

SVC Action

Go to the 5

Normal

(1)(3)

(2) (4)

<CON4>

10. REFERENCE

- 40 -

After measure the values, you should put in the TPA again.

10-1 TEST MODE and Removing TPA

1. How to enter the TEST MODEIf you push the test button on the Main PCB, the refrigerator will be enter the TEST MODE.

2. How to remove Terminal Position Assurance (TPA)

* 1 time : Comp / Damper / All FAN on(All things displayed)

Main PWB

<AC TPA> <DC TPA>

* 2 times : Damper closed (22 22 displayed)

* 3 times : Forced defrost mode(33 33 displayed)

- 41 -

10-2 TEMPERATURE CHART - FREEZER AND ICING SENSOR

TEMP

-39°F (-40°C)

-30°F (-35°C)

-21°F (-30°C)

-13°F (-25°C)

-4°F (-20°C)

5°F (-15°C)

14°F (-10°C)

23°F (-5°C)

32°F (0°C)

41°F (5°C)

50°F (10°C)

59°F (15°C)

68°F (20°C)

77°F (25°C)

86°F (30°C)

95°F (35°C)

104°F (40°C)

RESISTANCE

73.29

53.63

39.66

29.62

22.33

16.99

13.05

10.10

7.88

6.19

4.91

3.91

3.14

2.54

2.07

1.69

1.39

VOLTAGE

4.09 V

3.84 V

3.55 V

3.23 V

2.89 V

2.56 V

2.23 V

1.92 V

1.63 V

1.38 V

1.16 V

0.97 V

0.81 V

0.67 V

0.56 V

0.47 V

0.39 V

- 42 -

10-3 TEMPERATURE CHART - REFRIGERATOR AND DEFROST SENSOR

TEMP

-39°F (-40°C)

-30°F (-35°C)

-21°F (-30°C)

-13°F (-25°C)

-4°F (-20°C)

5°F (-15°C)

14°F (-10°C)

23°F (-5°C)

32°F (0°C)

41°F (5°C)

50°F (10°C)

59°F (15°C)

68°F (20°C)

77°F (25°C)

86°F (30°C)

95°F (35°C)

104°F (40°C)

RESISTANCE

225.1

169.8

129.3

99.30

76.96

60.13

47.34

37.55

30

24.13

19.53

15.91

13.03

10.74

8.89

7.40

6.20

VOLTAGE

4.48 V

4.33 V

4.16 V

3.95 V

3.734 V

3.487 V

3.22 V

2.95 V

2.67 V

2.40 V

2.14 V

1.89 V

1.64 V

1.45 V

1.27 V

1.10 V

0.96 V

- 43 -

10-4 How to check the Fan-Error

(1) EBR673480After sending a signal to the fan, the MICOM checks the BLDC fanmotor s lock status. If there is no feedback signal from the BLDC fan,the fan motor stops for 10 seconds and then is powered again for 15seconds. To determine that there is a fan motor malfunction,this process is repeated 3 times. If the fan motor is determined to bedefective, the error code will be shown in the display for 30 minutes.At this point, the process will be repeated until the fan motor operatesnormally. If normal operation is achieved, the error display is erased andthe MICOM is reset automatically.

No signal Error Display

15s

10s

15s

10s

15s

Normal drive

No signal Repeat

20s

10s

15s

10s Pause 30minPause 30min 10s

15s 20s

- 44 -

11. COMPONENT TESTING INFORMATION

11-1 Defrost Controller Assembly

Function - Controller assembly is consist of 2 kinds of part those are fuse-m and sensor. we candecide part is defect or not when we check the resistance.

- Fuse-M can cut off the source when defrost heater operate the unusual high temperature.- Sensor give temperature information to Micom

How toMeasure(Fuse-M)

Measure the 2 pin connected to Fuse-M.If the ohmmeter indicate below 0.1ohmFuse-M is good. If Fuse-M measures infiniteohms, it is open and needs to be replaced.

How toMeasure(Sensor)

Measure the 2 pin connected to Sensor.If the ohmmeter indicate 11 (at roomtemperature) It is normal.Checking the resistance at othertemperatures, check the sensor resistancechart.

Standard Sensor (at room temperature)

Test Point

(1) to (2)

Ressult

11

Fuse-M (at all temperature)

Test Point

(1) to (2)

Ressult

0 ~ 0.1

(1) to (2)

(1) to (2)

- 45 -

11-2 Sheath Heater

Function Sheath heater is a part for defrost.

How toMeasure

Measure the 2 pin connected to Sheath Heater.If resistance is between 34 ~ 42 ohms, the heater is normal. If it measures infinite ohms the heater is open and needs to be replaced.

Standard Sheath heater (at all temperature)

Test Point

(1) to (2)

Ressult

34 ~ 42

(1) (2)

- 46 -

11-3 Door Heater Assembly

Function The heater is designed to prevent the exterior moisture on the door.

How toMeasure

StandardTest Point

(1) to (2)

Ressult

1,674 ~ 1,926

1

23

5

89

467

- 47 -

11-4 Door Switch

Function Senses when the door is opened or closed by sending a signal to the Main PCB.

How toMeasure

<Switch, Freezer> <Switch, Refrigerator>

Check the resistance between connectors 1, 2 and 3, 4.

Standard

Beep Beep

Multimeter beep – Switch F,R

Nomal

0

Push the button(Plunger)

None (

Button(Plunger)

1 2 3 4

3 4 2 1

1 2 3 4

- 48 -

11-5 Solenoid

Function - Dispenser solenoid : When customer push the dispenser button, Pull duct door andabstract from ice bank.

How toMeasure

Standard

Dispenser Solenoid

Dispenser Solenoid

Test Points

(1) to (2)

Result

44 ~ 54

(1) (2)

- 49 -

11-6 AC Motor ASSEMBLY (Geared Motor & Solenoid)

Function The Geared Motor of ac motor assembly advances forward the ice by rotating the ice andThe solenoid of ac motor assembly selects one of the cube mode or crush mode.- Cube solenoid : Pulling the stir lip for moving the ice in icemaker system.

How toMeasure

< Geared Motor >

T.P

(1) (2)

(3)

(4)

Terminalof solenoid

< Geared Motor >

Standard Geared Motor

Test Points

(1) to (2)

Result

2.38 ~ 4.02

Cube Solenoid

Test Points

(1) to (3)

Result

32 ~ 40

Take out the malehousing fromfemale housing

Measure theresistance between(1) and (2)

Check the resistance between connectors (Geared motor 1, 2) and (solenoid 3, 4). Itmeans check whether or not applying an Electric current. If there is resistance, it meansthe geared motor or solenoid is not inferiority

1

2

Remove the femalehousing fromterminal.

Measure the resistance between(3) and (4)

1

2

- 50 -

11-7 Damper

Function The damper supplies the cold air from the freezer to the refrigerator section.

How toMeasure

< Damper Circuit >

< extension >

Check the ,

Standard Damper

Test Points

Red and Yellow

Result

373 ~ 456

Test Points

Blue and White

Result

373 ~ 456

Check the resistance between connectors 1,3 and 2,4.

1 Blue 1 Blue

2 Red

3 White

3 White

1 3

Check the , 2 4 Check the , 1 3

3 Yellow

12. TROUBLESHOOTING

- 51 -

PCB Check (Simplify)

Test Mode

Power Off Power On PCB OK

Replace Driver PCB

N

YTime>30sec& V≒200

Con202Disconnect

A-inverterTEST 1 Mode

Protection Logic

Check Voltage about 200Vpast 30second after turn on

Troubleshooting

N

Y

N

N

Y

Y

Y

N

NN

Y

Y

Y

N

N

Y

Y N

N

NotCooling

Y N

N

N

N

N

Y

N

YRecheck

LED blink 1

LED blink 7

LED blink 5

LED blink2

LED blink6

Reset

Reset

Reset

Reset

LED blink 1

LED blink 7

Replace Driver PCBComp.Check?

Replace Driver PCB

LED blink 5

LED blink2

Heavy Repair

Heavy Repair

Comp.Work?

Comp.Check? Replace Comp.

Comp.Work?

Comp.Check?

HarnessCheck?

Leakage? Recheck

Reset LED blink6

Heavy Repair

Heavy Repair Recheck

Replace Driver PCBComp.Work?

Comp.Check?

Refrigerantleak ?

IPM output>

80V-20%

Refrigerantleak? Recheck

Fix Harness

Comp.Work?

Comp.Check?

Leakage? Recheck

Reset

Check C

LEDBlink?

Ref.Comp

FC75(A-Inverter)Refer

TEST1 Forced Starting TDC (Full Stroke)

Display & sound

Display ON, Buzz 1 time

- 52 -

12-1 Check A

- There is PC Board located in the PCB case.The control driver is PC board for the compressor.

- This step shows the source voltage of the driver PC board.

- Visually inspect fuse and measure DC high voltage.- Measure the DC low voltage that supplies the inverter circuit.

E-Inverter

A-InverterFC75LBNA

* There is a PCB located in the PCB case next to thecompressor. That is the driver PCB. the linearcompressor.

PCB Malfunction Check

Step 3. Check Fuse (visual inspection)

Step 4. Check DC High Voltage (Multi Tester) Spec. about 330V DC

Step 5 Check DC low voltage (Multi Tester)Spec. A Point 15V

B Point 5V

Step 6 Check LED BlinkSee Check B

LED

B

A

GNDVoltage

- 53 -

A-Inverter

MultiTester

- Measure the voltage between the POWER and COMM pins of the connector as shown below.

Check to make sure compressor is receiving voltage from IPM

- In order to determine whether the compressor is operating normally,check the output voltage during the refrigeration cycle.

- After initial power-up, when the compressor begins to operate, wait 10minutes before checking.

- The compressor is operating normally if the voltage is greater than 80V.

IPM Output check

- 54 -

12-2 Check B

B1. LED blinks once, then repeats (FCT0 Fault: A-Inverter)

- Purpose: Detecting motor current and voltage error- Check voltage at point A (Motor Voltage), point B (Motor Current) and Point C (Capacitor

Voltage) when compressor is off.- Spec: Points A, B, & C 2.5V 0.3V- Logic: Compressor is forced to off and will try to restart after 20 seconds.

Protection Logic

Blink OFF Blink OFF

Y

N

Protectionlogic

Check B

Blink 1 time(FCT 0) Check B1

Out of spec?(2.2 - 2.8V)

Reset Power

Replace Driver PCB

B2. LED blinks two times, then repeats (Stroke Trip: A & E Inverters) Protection Logic

Blink Blink OFF Blink Blink OFF

Y

Y

Y

Y

Protectionlogic

Check B

Blink 2 times(Stroke Trip) Check B2

CompressorDoesn’t work

Y

N CompressorWorks Intermittently

CapacitorSpec.

Check C

CompressorDamageCheck C

ReplaceCapacitor

ReplaceCompressor

N

N

ResetPower

Stroke TripOccur?

Y

RepeatCheck Procedure

HarnessConnecting

Check C

Fix HarnessN

N

CycleCheck E

FixCycle

ReplaceDriver PCB

OK

NG

- Purpose: Prevent abnormally long piston strokes.- Case 1. If compressor doesn’t work and LED blinks - Cause: Possibly harness from compressor to PCB might be

defective.- Case 2. If compressor works intermittently and LED blinks - Cause: Condenser Fan or Freezer Fan is not running. Sealed

system problem such as moisture restriction, restriction at capillary tube or refrigerant leak.- Logic: Compressor is forced to off and then tries to restart after 1 minute.

C

AB

- 55 -

B3. LED blinks five times, then repeats (Locked Piston: A & E Inverters) Protection Logic

Protection Logic

Blink Blink Blink Blink Blink OFF

Protectionlogic

Check B

Blink 5 times(Lock Piston Trip) Check B3



ResetPower


N

Y

ReplaceCompressor

Hi siderestriction

N

Y

SealedsystemRepair

- Purpose: To detect locked piston- Cause: Lack of oil to the cylinder, cylinder or piston damaged and or restricted discharge.

A Locked Piston can also be caused by foreign materials inside the compressor.- Logic: Compressor is forced off and tries to restart within 2.5 minutes.

B4. LED blinks six times, then repeats (Current Trip: A & E-Inverters)

Blink Blink Blink Blink Blink Blink OFF

Protectionlogic

Check B

Blink 6 time(Current Trip) Check B4

CompressorIntermittently

works

Y CapacitorSpec.

Check C2

CompressorDamage

Check C3

ReplaceCapacitor

ReplaceCompressor

NG

NGResetPower

Y

Current tripOccur?

Y


IPMCheck B5

Y

ReplaceDriver PCB

NG

N Y

N

CycleCheck E

Y

FixCycle

- Purpose: Prevent over-current (overload protect)- Cause: Ambient temperature is high (over 43°C) and/or refrigerator’s condenser air movement is restricted.- Condenser Fan is stopped, restricted discharge line, compressor is damaged, or IPM device is defective.- Logic: Compressor is forced off and tries to restart after 2.5 minutes.

- 56 -

B5. LED blinks seven times, then repeats (IPM Fault: A & E Inverters) Protection Logic

Blink BlinkBlink Blink Blink Blink Blink OFF

Protectionlogic

Check B

Blink 7 times(Lock Piston Trip) Check B5


Y

N RepeatCheck Procedure

ReplaceDrive PCB

N

Y

Check IPMvisual inspection

(turn off)

ShortTest

Point A

PowerReset

CompressorDamage

Check C3Replace

Compressor

NG

Y

Modify

- Purpose: Prevent high current due to IPM Short- Cause: Damaged IPM (Dead Short)- Test for a dead short at Point A with a VOM.- Logic: Compressor is forced off and tries to restart in 2.5 minutes.

A

- 57 -

12-3 Check C

C1. Harness Connection CheckC2. Capacitor SpecificationsC3. Compressor Check

- Step 1. Power off. Step 2. Check capacitor spec. (table1). Step3. Check resistance of point AStep 4. Check wire harness (INF ohm). Step 5. Check resistance at point B. Step 6. Point D.

Check Process

Poweroff

Resistanceat Point A6~8ohm

HarnessConnecting

OK

ProblemA~B

CheckCapacitor

Spec.

Resistanceat Point B6~8ohm

Resistanceat Point D6~8ohm

ReplaceCompressor

ProblemB~D

Checkwiring to

compressor

Y

N

N

Y

Y

Y

N

N

Check Compressorterminals

HarnessProblem

YN

Y

- Measure the resistance at each point except point C- Dead short check: measure the resistance between power line in compressor and earth ground in refrigerator (Inf. Ohm)

FC150NAMA

��

MultiTester

��

��

�

��

Capacitor Spec.450V, 18μF±5%

��

��

��

�

�

MultiTester

MultiTester

MultiTester

��

��

Caution : Turn off power during check C

* Because of ambient temperature or operatingsituations, the values shown can have a slightdeviation.

- 58 -

12-4 Check D

D1. Activate Protection logic

- We have to check Condenser fan and Freezer fan before performing Check D- Locked Piston, Current trip and stroke trip can be activated by other problems then the driver or compressor.

Cycle check with protection logic

High PressureSide

Restricted

→ When process line on compressor is opened, and refrigerant is not expelledbecause it has accumulated in condenser.

→ If fault is corrected after refrigerant is recaptured from sealed system, change dryer.

→ Low side restriction can cause a stroke trip.→ If fault is corrected after refrigerant is recaptured, perform a sealed

system evacuation and dryer replacement.

→ Check Suction line→ If refrigerant is overcharged and suction line temperature is lower

than ambient temperature (about 5~10 degrees) or frost is present150mm from where the suction line enters the compressor..

→ Customer complains of longer run times and poor cooling performance.→ Lack of refrigerant can, in some incidents, cause piston over travel.→ Pressure of refrigerant cycle is usually higher than ambient pressure,

therefore oil will flow out with the refrigerant at leak point.

→ Temp. of compressor and discharge line is normal to slightly higher.High side pressure is normal to slightly higher than normalconditions. This is because condenser cannot condense the airthat is trapped in the condenser. The high side pressure andtemperature will not mimic the low side pressures andtemperatures.

Over chargingRefrigerant

Low sideRefrigeration

leak

Locked piston

Current trip

Refrigerant leak

LowSide

Restriction

Stroke trip

D2. sealed system diagnosis

- Check as follows;

Sealed system

No

No

Check for oilRemaining in drip tray

Check for Oil leaksIn machine compartment

Comp,Cond T >Ambient temp+5deg

Check Temp ofDischarge lineand Condenser

Check frost statusOf Evaporator

Is frost patternuniform?

Heat Inlet tubingusing heat gun.

Is frost paternUniform?

OK

YesYes

No

Frost onlyEvaporator inlet

Yes

No

Sealed Systemis OK

Sealed Systemis OK

Repair leakat point whereOil is present.

Yes

Yes

A

In/Out Leakage

EvaporatorLeakage

A

ReplaceEvaporator A

A

Check for Oil leakageat each joint

of the Evaporator

Is there froston Suction Line?

Yes

ANo

No

A Heavy repair

Welding point1. Comp process stub,2. Comp discharge3. Hot Line inlet4. Drier inlet5. Drier outlet6. Evaporator inlet7. Evaporator outlet8. suction pipe

- 59 -

Compressor Troubleshooting

Step 1) Loosen up screw of Case Assembly PCB and openthe Cover PCB

Step 2) Check for blinking frequency of LED, PWB

If compressor is normal, it does not blink : Refer to the next page to find out what actions to take according to how many times LED blink

- 60 -

LED two - time repetiton (Stroke Trip)

on - on - off - on - on - off - on - on - off repeating

PCB Partsdefect orCompressorConnectormissconnecting(Pistonover run)

1. Please check, Whetherconnector ofcompressor is attachedrightly or not. afterpower off

2. After the first action,You check on normaloperation ofcompressor.

3. If the same symptomarises after the secondaction, replace PCB

Pistonconstraint

1. After resetting power,check if it is runningnormal

2. If the same symptomarises after the firstaction

3. If the same symptomarises after the secondaction, replacecompressor

CircuitovercurrenterrorOr cycleerror


2. If the same symptomarises after the firstaction

3. If the same symptomarises after the secondaction, replacecompressor

PCB partsdefect(IPM)


2. If the same symptomarises after the firstaction, replace PCB

1

LED five - time repetiton (Piston Lock Trip)

on - on - on - on - on - off - on - on - on - on - on - off repeating

2

LED six - time repetiton (Current Trip)

on - on - on - on - on - on - off - on - on - on - on - on - on - off repeating

3

LED seven- time repetiton (IPM Fault Trip)

on - on - on - on - on - on - on - off - on - on -on - on - on - on- on - off repeating

4

No LED operating condition Cause Service guideline

- 61 -

12-5 SERVICE DIAGNOSIS CHART

COMPLAINT POINTS TO BE CHECKED REMEDY

No Cooling. • Is the power cord unplugged from the outlet?• Check if the power switch is set to OFF.• Check if the fuse of the power switch is shorted.• Measure the voltage of the power outlet.

• Plug into the outlet.• Set the switch to ON.• Replace the fuse.• If the voltage is low, correct the wiring.

Cools poorly. • Check if the unit is placed too close to the wall.• Check if the unit is placed too close to the stove,

gas cooker, or in direct sunlight.• Is the ambient temperature too high or the room

door closed?• Check if food put in the refrigerator is hot.• Did you open the door of the unit too often or check

if the door is sealed properly?• Check if the Control is set to Warm position.

• Place the unit about 4 inches (10 cm) from the wall.• Place the unit away from these heat sources.

• Lower the ambient temperature.

• Put in foods after they have cooled down.• Don't open the door too often and close it firmly.

• Set the control to Recommended position.

Food in theRefrigerator isfrozen.

• Is food placed in the cooling air outlet?

• Check if the control is set to colder position.• Is the ambient temperature below 41°F(5°C)?

• Place foods in the high-temperature section. (front part)

• Set the control to Recommended position.• Set the control to Warm position.

Condensation or iceforms inside the unit.

• Is liquid food sealed?• Check if food put in the refrigerator is hot.• Did you open the door of the unit too often or check

if the door is sealed properly?

• Seal liquid foods with wrap.• Put in foods after they have cooled down.• Don't open the door too often and close it firmly.

Condensation formsin the Exterior Case.

• Check if the ambient temperature and humidity ofthe surrounding air are high.

• Is there a gap in the door gasket?

• Wipe moisture with a dry cloth. It will disappear inlow temperature and humidity.

• Fill up the gap.

There is abnormalnoise.

• Is the unit positioned in a firm and even place?

• Are any unnecessary objects placed in the backside of the unit?

• Check if the Drip Tray is not firmly fixed.• Check if the cover of the compressor enclosure in

the lower front side is taken out.

• Adjust the Leveling Screw, and position therefrigerator in a firm place.

• Remove the objects.

• Fix the Drip Tray firmly in the original position.• Place the cover in its original position.

Door does notclose well.

• Check if the door gasket is dirty with an item likejuice.

• Is the refrigerator level?

• Is there too much food in the refrigerator?

• Clean the door gasket.

• Position in a firm place and level the LevelingScrew.

• Make sure food stored in shelves does not preventthe door from closing.

Ice and foodssmell unpleasant.

• Check if the inside of the unit is dirty.• Are foods with a strong odor unwrapped?• The unit smells of plastic.

• Clean the inside of the unit.• Wrap foods that have a strong odor.• New products smell of plastic, but this will go away

after 1-2 weeks.

Other possible problems:

Check if frost forms inthe freezer.

Check therefrigeration system.

Check the Thermistor.

Not defrosting

The systemis faulty.

The operation ofthe Thermistor isincorrect.

Check Components of thedefrosting circuit.

Perform sealedsystem repair.

Replace the Thermistor.

- 62 -

12-6 REFRIGERATION CYCLE

Troubleshooting Chart

PARTIALLEAKAGE

Freezercompartment andRefrigerator don'tcool normally.

Low flowing sound ofRefrigerant is heardand frost forms ininlet only.

A little higher thanambienttemperature.

• Refrigerant level is low dueto a leak.

• Normal cooling is possible byrestoring the normal amountof refrigerant and repairingthe leak.

COMPLETELEAKAGE


Flowing sound ofrefrigerant is notheard and frost isn'tformed.

Equal to ambienttemperature.

• No discharging ofRefrigerant.

• Normal cooling is possible byrestoring the normal amountof refrigerant and repairingthe leak.

LEA

KA

GE

PARTIALCLOG


Flowing sound ofrefrigerant is heardand frost forms ininlet only.


• Normal discharging of therefrigerant.

• The capillary tube is faulty.

WHOLECLOG

Freezercompartment andRefrigerator don'tcool.

Flowing sound ofrefrigerant is notheard and frost isn'tformed.


• Normal discharging of theRefrigerant.

MOISTURE CLOG Cooling operationstops periodically.

Flowing sound ofrefrigerant is notheard and frost melts.

Lower than ambienttemperature.

• Cooling operation restartswhen heating the inlet of thecapillary tube.

CLO

GG

ED

BY

DU

ST

COMP-RESSION

Freezer andRefrigerator don'tcool.

Low flowing sound ofrefrigerant is heardand frost forms ininlet only.


• Low pressure at high side ofcompressor due to lowrefrigerant level.

NO COMP-RESSION

No compressingoperation.

Flowing sound ofrefrigerant is notheard and there isno frost.


• No pressure in the highpressure part of thecompressor.

DE

FE

CT

IVE

CO

MP

RE

SS

ION

CAUSE REMARKSSTATE OF THEEVAPORATOR

TEMPERATUREOF THE

COMPRESSOR

STATE OFTHE UNIT

- 63 -

12-6-1 SEALED SYSTEM DIAGNOSIS

“Not Cooling” ComplaintAll components operating, No airflow problems, Not frosted up as a defrost problem

problem has been isolated to sealed system area

FrostPattern?

Partial

EqualizationTest

Very Slow

None

EqualizationTest

Very FastFast

Very Fast

InefficientCompressor

PartialRestriction

CompleteRestriction

CondenserTemperature

Cap TubeSound

Yes

No

Air/Low SideLeak

Loss of Change

Very Slow

FaintHotter than Normal

None to WeakRoom Temperature

Compressor NotPumping

Trace of Oil

Undercharge

(The equalization test is trying to restart a compressor using a start kit after it has been operating.)

Leak

- 64 -

13. OPERATION PRINCIPLE AND REPAIR METHOD OF ICEMAKER

13-1 OPERATION PRINCIPLE

13-1-1 Operation Principle of IceMaker

Power On

Start Position • Adjusts EJECTOR to Start Position with power on.

IcemakingMode

• Waits until water becomes ICE after starting theicemaking operation.

HarvestMode

• Runs MOTOR to drop ice from the tray into the ICE BIN.(During harvest mode, check if the ice bin is full)

Park Position • Reaches Start Position

Fill• Performs Ice Making Mode after supplying water by

operating the SOLENOID in ICE VALVE.

Test Mode • To operate LINE and SERVICE, press and hold the Fill Key for 3 seconds. The icemaker will run through 3 stages: Harvest Fill Icemaking.

1. Turning the Icemaker stop switch off (O) stops the ice making function.2. Setting the Icemaker switch to OFF and then turning it back on will reset the icemaker control.

PowerSwitch

Test ButtonHole(use toollike pin end of tool have to smooth) pin,

Ejector

AutomaticShutoff Arm

Cube SizeIndicator Light

- 65 -

13-2 ICE MAKER FUNCTIONS

13-2-1 Icemaking Mode

1. Icemaking refers to the freezing of supplied water in the ice tray. Complete freezing is assured by measuring thetemperature of the Tray with Icemaking SENSOR.

2. Icemaking starts after completion of the water fill operation.3. The Ice Making function is completed when the sensor reaches 19°F (-7°C), 55 minutes after starting.

NOTE : After Icemaker Power is ON, the Icemaker heater will be on for test for 6 sec.

13-2-2 Harvest Mode

1. Harvest (Ice removing) refers to the operation of dropping ices into the ice bin from the tray when icemaking hascompleted.

2. Harvest mode:(1)The Heater is ON for 30 seconds, then the motor starts.(2)The feeler arm senses the quantity of ice in the ice storage bin while rotating with the EJECTOR.

A. Ice storage bin is full : The EJECTOR stops (heater off).B. Ice storage bin is not full : The EJECTOR rotates twice to open for ice.

If the EJECTOR does not rotate once within 5 minutes in B mode, separate heater control mode starts operating toprevent the EJECTOR from being constrained. (It is recommended that the user open for ice to return to normal mode.)

13-2-3 Fill/Park Position

1. Once a normal harvest mode has been completed, the water solenoid will be activated.2. The amount of water is adjusted by pressing the Fill Key repeatedly. This changes the time allowed for fill as illustrated in

the table below.

STAGE TIME TO SUPPLY INDICATIONS REMARKS

1 5 sec.The water amount will varydepending on the water controlSwitch setting, as well as thewater pressure of the connectedwater line.

Water supply amount TABLE

25.5 sec.

(FIRST STAGE)

3 6 sec.

- 66 -

STAGE ITEMS INDICATOR REMARKS

1 HEATERFive seconds after heater starts, a heaterwill go off if the temperature by sensor ishigher than 10°C

Diagnosis TABLE

2 MOTORFive seconds after heater starts, you canconfirm that a motor is moving.

3 HALL IC ICheck if Ice Bin is full or not.If Ice bin is full, the motor and heater areoff and on stand by until Ice bin is empty.

4 HALL IC II You can confirm HALL IC detection ofstart position.

5 VALVE Two seconds after detection of startposition, you can confirm that valve is on.

6 ResetFive seconds after fifth stage iscompleted, The icemaker resets to initialstatus.

Return to Status prior toTEST MODE

NO DIVISION INDICATOR REMARKS

1 Normal Display switch operatesproperly

Mark time to supply

2Icemaking

Sensormalfunction

Make sure that the wire oneach sensor is connected.

CONTENTS

None

Open or short-circuited wire

13-3 DEFECT DIAGNOSIS FUNCTION

13-3-1 ERROR CODES shown on Ice Maker water supply control panel

13-2-5 Function TEST

1. This is a forced operation for TEST, Service, cleaning, etc. It is operated by pressing and holding the Fill Key for3seconds.

2. The test works only in the Icemaking Mode. It cannot be entered from the Harvest or Fill mode.3. Caution! If the test is performed before water in the icemaker is frozen, the ejector will pass through the water. When the

Fill mode begins (Stage 4), unless the water supply has been shut off, added water will overflow into the ice bin. If thecontrol doesn’t operate normally in the TEST mode, check and repair as needed.

4. After water is supplied, the normal CYCLE is followed : icemaking Harvest Park Position Fill.5. Five seconds after Stage 5 is completed, the Ice Maker returns to MICOM control. The time needed to supply water

resets to the pre- test setting.

- 67 -

14. DESCRIPTION OF FUNCTION & CIRCUIT OF MICOM

14-1 FUNCTION

14-1-1 Function

1. When the appliance is plugged in, it is set to 37°F for Refrigerator and 0°F for freezer.You can adjust the Refrigerator and the Freezer control temperature by pressing the ADJUST button.

2. When the power is initially applied or restored after a power failure, it is set to Control temperature Previously.

14-1-2 How to Toggle the Display between °F & °C

1. The initial setting is °F and the display temperature mode can be changed from °F to °C or °C to °F by pressing andholding the FRZ TEMP and the REF TEMP keys at the same time for over 5 seconds.

14-1-3 Lock function (dispenser and display button lock)

1. When the refrigerator is first turned on, the buttons are not locked.“LOCK” is deactivated with no light on.

2. To lock the display, the dispenser, and the control panel, pressand hold the LOCK button for 3 seconds. “LOCK” is activated withlight off.

3. The LOCK button is the only control feature that remains activein the locked state. The buzzer sound, other control buttons,and the dispenser are deactivated.

4. To release from the locked state, press and hold the LOCKbutton again for 3 seconds.

14-1-4 Filter condition display function

1. There is a replacement indicator light for the filtercartridge on the dispenser.

2. Water filter needs replacement once six months or ofusing water filter.

3. When the Water Filter Icon is turn on you mustexchange the filter.

4. After replacing the filter, press and hold the Light/Filterbutton for more than 3 seconds.After then water Filter icon turn off with reset status.

Ex) In selecting"LOCK"

Ex) In selecting"LOCK" again

In initial Power On/ Filter RESET

Light On

Filter StatusDisplay

Classification

- 68 -

14-1-7 CONTROL OF FREEZER FAN MOTOR

1. Freezer fan motor has high and standard speeds.2. High speed is used at power-up, for Ice Plus, and when refrigerator is overloaded.

Standard speeds is used for general purposes.3. To improve cooling speed, the RPM of the freezer fan motor change from normal speed to high.4. High speed (2700RPM) : Initial power on or load corresponding operation, Ice Plus

Normal speed (2400RPM) : General working conditions.5. Fan motor stops when refrigerator or freezer door opens.

14-1-8 Cooling Fan Motor

1. The cooling fan is switched ON and OFF in conjunction with the compressor.2. The cooling fan runs at a single speed.3. The Failure sensing mathod is the same as in the fan motor of the freezing fan motor(refer to failure diagnosis function

table for failure display).

14-1-9 Icing Fan

1. The Icing Fan is controlled by the the sensor on the top of the ice room.2. The Failure sensing mathod is the same as in the fan motor of the freezer.

(refer to failure diagnosis function table for failure display)

14-1-5 Ice Plus selection

Please select this function for quick freezing.• When you press the Ice Plus Button, the Ice Plus ICON will be

turned on again.• Ice Plus function automatically turns off after a fixed time passes.

14-1-6 Dispenser use selection

You can select water or ice by separated pad switch.

• When you press ice type button, ice type will be changed. (Crush orCube)

• Hold your cup in the dispenser for a few seconds after dispensingice or water to allow the last pieces of ice drops of water to fall intothe cup.

• When after initially establ ishing the water comes out, the water tankinside fills and until at the time of quality the hour is caught.

WATER PADICE PAD

- 69 -

14-1-10 ICE PLUS FRZ

1. The purpose of this function is to intensify the cooling speed of freezer and to increase the amount of ice.2. Whenever selection switch is pressed, selection/release, the Icon will turn ON or OFF.3. If there is a power outage and the refrigerator is powered on again, Ice Plus will be canceled.4. To activate this function, press the Ice Plus key and the Icon will turn ON. This function will remain activated for 24 hrs.

The first three hours the compressor and Freezer Fan will be ON. The next 21 hours the freezer will be controlled at thelowest temperature. After 24 hours or if the Ice Plus key is pressed again, the freezer will return to its previoustemperature.

5. During the first 3 hours :(1)Compressor and freezer fan (HIGH RPM) run continuously.(2)If a defrost cycle begins during the first 90 minutes of ICE PLUS, the ICE PLUS cycle will complete its cycle after

defrosting has ended.If the defrost cycle begins when Ice Plus has run for more than 90 minutes, Ice Plus will run for two hours after thedefrost is completed.

(3)If ICE PLUS is pressed during defrost, ICE PLUS Icon is on but this function will start seven minutes after defrost iscompleted and it shall operate for three hours.

(4)If Ice Plus is selected within seven minutes after compressor has stopped, the compressor (compressor delays sevenminutes) shall start after the balance of the delay time.

(5)The fan motor in the freezer compartment runs at high speed during ICE PLUS.6. For the rest of the 21 hours, the freezer will be controlled at the lowest temperature.

14-1-11 Alarm for Open Door

1. This feature sounds a buzzer when the freezer or refrigerator door is not closed within 1 minute after it is opened.2. One minute after the door is opened, the buzzer sounds three times each for 1/2 seconds. These tones repeat every 30

seconds.3. The alarm is cancelled when the freezer or the refrigerator is closed while the buzzer sounds.

Freezer Dooror Refrigerator

Door

Closed Open Closed ClosedOpen

3 Times 3 Times 3 Times 3 Times

Within 1 min. 1 min.30 sec 30 sec 30 sec

Buzzer

14-1-12 How to set the display mode and cancel it

1. With the refrigerator door open, keep pressing the Refrigerator Temp Button and ICE PLUS Button more than 5 seconds,then it goes to the display mode with Special Beep Sound With Special Beep Sound.

2. Perform the same way again to cancel the display mode.3. All Freezing unit will be turned off at display mode (Exceptions : Lamp, Display)

- 70 -

14-1-13 Defrosting (removing frost)

1. Defrosting starts each time the COMPRESSOR running time reaches 7~50 hours.2. For initial power on or for restoring power, defrosting starts when the compressor running time reaches 4 hours.3. Defrosting stops if the sensor temperature reaches 46°F(8°C) or more. If the sensor doesn’t reach 46°F(8°C) in

1 hours, the defrost mode is malfunctioning. (Refer to the defect diagnosis function, 8-1-14.)4. Defrosting won’t function if its sensor is defective (wires are cut or short circuited)

14-1-14 Defect Diagnosis Function

1. Automatic diagnosis makes servicing the refrigerator easy.2. When a defect occurs, the buttons will not operate.3. When the defect CODE removes the sign, it returns to normal operation (RESET).4. The defect CODE shows on the Refrigerator and Freezer Display.

LED check function : If simultaneously pressing Ice Plus button and freezing temperature adjustment button for a second,display LED graphics on. If releasing the button, the LED graphic displays the previous status.

- 71 -

15. EXPLODED VIEW & REPLACEMENT PARTS

CASE PARTSCAUTION : Use the part number to order part, not the position number.

S02

501F

S01103A

103B

S01

207B

S03

402A

271B

B01

503E

603B603C

626A624G

607A

624C

624A

120A409D

503D

158AS11

120B

282G

S08

145A

282F

302B

S14

262B

B02

323B

319A

319C

S20

420A

309B 329C

312C

312A

310B

314A300A

316A 318A

105A

317A

249M

262H

S14

249D

249C

B02

S12

S12

145B

610AS10

271D

B01

610D

207A

S03

402A

610B

313A

411A

500A

408A

405F

S17

B04

315C

315B

315B

315C

407B

315A

103C

404A

405C 405B

329A

316B

400A

304A

332C

S16

407A

610C

249L

409E158B 503F

283B

283B

B03

B03

106A

504A

413A

410G

500H

290A

303A

406B

106A

406D

- 72 -

FREEZER PARTSCAUTION : Use the part number to order part, not the position number.

131A

250G

203D

136B 250G

251A 251B

237C

136A203C

- 73 -

REFRIGERATOR PARTSCAUTION : Use the part number to order part, not the position number.

* : on some models

162A

145D

162B

146E

151A

151C

161A

151B

154A

141D

161C

161B

141C

141B

141A

141C

141B

141A

141A

141B

141C

140A

142D

142B

142A

- 74 -

DOOR PARTSCAUTION : Use the part number to order part, not the position number.

60�3�

603�

234B

241A

241C 241B

234A

233D 233A 231A

212G234C

B05

250B

249E

249J203A

201A200A

200B

249F

250B249K

B06

212D

250B

249E

249J

B06

212D

B06

250A

203B

201B

249K250B

249F

B06

244A

B05

243A

243D

262C

262E

312B

B05

244A 615A619B

603C

603C

616H

250A

262C

243B

243C

233C

234D

233B231B

230B 230A

B05

241D

241D

241E

241G

- 75 -

DISPENSER PARTSCAUTION : Use the part number to order part, not the position number.

276A

276B

405A

279I

278B

279H

279J

402C

402C

278C

402C

278C

501D

279B

281A

278D

279D

500C

279E

501A

279A

281B

275A

279C

- 76 -

ICE & MAKER PARTSCAUTION : Use the part number to order part, not the position number.

619E

603B

619A

627A

627B

616F

616D

625A

616G

623B616G

623B

616J

603C

616D

616J

617A

S31

S32

- 77 -

ICE BANK PARTSCAUTION : Use the part number to order part, not the position number.

6�

630C�

6606A

614A

630E

630D

630L

630N

630M

630K

630A

630C

630F

630B

611A600A

630J

600B612A

630H

630G

P/No. MFL48178827 MAR., 2010 Printed in Korea

MFL48178827LG Studio Series

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