Repair Guide for Combi Ref Demesa

COMBI NO FROST REFRIGERATORS REPAIR MANUAL DAEWOO ELECTRONICS MANUFACTURING ESPAÑA S.A

2004 DEMESA Página: 1

REPAIR GUIDE FOR DAEWOO COMBI REFRIGERATORS

DAEWOO ELECTRONICS MANUFACTURING ESPAÑA S.A.U ZURRUPITIETA 27 POL. IND JUNDIZ 01015

VITORIA-GASTEIZ - SPAIN

English copy. REPORTER: Bernardo Zapatero.



INDEX

PROBLEM PAGE REVISION

• GASKET GAP 3 0

• VAPORY CASE OVERFLOW 5 0

• FUSE TEMP BROKEN 7 0

• WATER FORMS IN WHITE DR 9 0

• ICING PROBLEM 10 0

• LAMP ON - UNDER COOLING 12 0

• SUMMER UNDER COOLING 13 0

• GASKET COMES OUT 14 0

• DOOR BAD ASSY 15 0

• REFRIGERANT PROBLEMS 16 0

• FOOD FROZEN IN R ROOM 19 0

• FROST IN F ROOM (SNOW) 20 0

• ANNEX 21 0

•

•

•

•

•

•

•

•



GASKET GAP

MODEL: - All models SYMPTOM: - Frost near gap area - Undercooling PROBLEM: - Gasket deformations produce gaps

between cabinet and gasket magnet surface

SOLUTION: - Deform and adjust gasket in order to reduce gap ACTION:

Rotate Gasket 180º

Heat Gasket damaged area with an industrial dryer

Force gasket until delete deformation



If previous operations are not enough, then apply “hot melt” solution. Hot melt is sold in “do it yourself stores”

Apply “hot melt” in liner guide where deformation is located

If deformation is very big, then apply more quantity in order to reduce more the distance between gasket and cabinet

Reparation finished



VAPORY CASE OVERFLOW MODEL: - All models SYMPTOM: - Water on the floor. PROBLEM: - A high humidity rate produces an overflow of vapory case. SOLUTION: - Increase heating temperature in vapory case in order to evaporate all water.

ACTION:

Attach an 8 watts heater cord to the down part of vapory case (well centered).

Connect heater in parallel connection with compressor.

Insulate connections with retractile tube.



Assembly again vapory case in the guides.

For HPL… compressors in 90% of overflow claims, changing to an aluminium vapory case the problem is solved, so before apply previous modification consider this possibility.



FUSE TEMP BROKEN (CONTROL S/W LOCKED) MODEL: - ERF Automatic models SYMPTOM: - F Led error (red off-on-on-off). - Under cooling PROBLEM: - Control button get locked and starts to make continuous forced defrosts till fuse get broken at 77ºC. SOLUTION: - Unlock control button - Replace fuse temp.

ACTION:

Control button get locked because is pussed strongly, or with dusty, or by a bad F-PCB assembly. First step is check F-PCB general assembly.

Disassembly window led and clean it well.

Clean F-pcb circuit with disolvent for avoid dusty shortages (if exist)



For A class models, if its necessary, increase control panel hole diameter for avoid obstruction in future (1mm aprox)

Replace fuse temperature and assembly it the same position



WATER FORMS IN WHITE DOORS MODEL: - ERF White models SYMPTOM: - Water forms in white doors. PROBLEM: - When doors suffer an overheating during manufacturing process, areas with air bubbles between plate and vinil cover get another different white tone. SOLUTION: - Heat plate till get uniform colour .

ACTION:

Locate areas with water forms and determine if problem is similar to the previous problem description.

Use a hair dryer in the maximal position and heat door left-right and top-down till get uniform colour.



ICING PROBLEM MODEL: - All models SYMPTOM: - Water on the floor - Case FA locked with ice PROBLEM: - Drain hole obstruction provokes a defrost water accumulation, and after several defrosts, water flows from freezer room. SOLUTION: - Clean ice, unlock drain hole

ACTION:

Disassembly freezer room Disassembly defrost heater

Take out main ice block breaking it by the middle

Use a hair dryer to clean the rest of ice



Unlock drain hole with a driver, and check that hole is clean pouring hot water trhought the hole

Clean drain cap with oil and cut a little the sleeves

IF model is a 310/340/370 with steel heater, then apply a plate heat transfer for avoid future obstructions

After finish operation, assembly freezer room, and empty vapory case for avoid overflow in the next automatic defrost



LAMP ALWAYS ON - UNDER COOLING

MODEL: - All models SYMPTOM: - Undercooling in R room. - Multi-duct melted. PROBLEM: - Door switch doesn’t touch door so lamp is always on. SOLUTION: - Lift up R door with washers in medium hinge.

ACTION:

Check if door touches with Switch door. If door touches it then:

- Input the maximal load to the pockets or force down door, and check again

Put necessary washers in medium hinge to lift up door and solve the problem



UNDER COOLING IN SUMMERTIME MODEL: - ERF A CLASS models SYMPTOM: - Under cooling in R room - High running rate PROBLEM: - Combi is not prepared for high ambient temperatures (32ºC over) SOLUTION: - Lift up R door with washers in medium hinge.

ACTION:

Check if louver B has assembled in main duct hole an eps like picture shows

Delete eps, and check if fan rotation is ok.

DUCTS CLOSED (RUNNING RATE UP)

DUCTS OPENED (RUNNING RATE DOWN)

Check shelves position and food storage: - check if some food is locking air ducts

Educate user:

- Recommend food storage system(free air ducts)

- Explain dial positions



GASKET COMES OUT

MODEL: - ERF Inox models SYMPTOM: - Under cooling in R room. - Frost PROBLEM: - Gasket disassembles SOLUTION: - Attach gasket with silicon and Loctite

ACTION:

Put silicon in liner guide and introduce gasket

Attach gasket sleeves to the liner with Loctite

* REMARK: This operation will be done only in the problem area



DOOR BAD ASSY MODEL: - All models SYMPTOM: - Door bad assembled- air gaps - F-Door touches with u-hinge PROBLEM: - Frost and open door-close problems SOLUTION: - Hinge adjustments

ACTION:

Check if under hinge in use has a 90º position with cabinet. If under hinge is not perpendicular, adjust it or replace it.

Check if medium hinge is perpendicular. In order to adjust one door inclined:

- Slack both screws, fix door in the proper position and screw them again strongly

In order to make a vertical adjustment:

- Assembly in shafts the necessary washers to get the proper position.

Check if gasket magnet get attached perfectly to the plate using a slim paper:

- If paper comes out very easily when we pull it out, that area must be reforced using previous indications and with “gasket gap repair manual”.

n.g

ok



REFRIGERANT PROBLEMS MODEL: - All models SYMPTOM: - Under cooling - Cooling n.g PROBLEM: - Low charge, obstructions, gas leak SOLUTION: - Repair circuit and recharge

ACTION:

Disassemble freezer room and keep the door opened and compressor working. After some minutes check if frost is uniform in all evaporator surface. If frost is uniform (like picture shows) , then we reject gas problem possibility.

IF evaporator doesn’t accumulate frost, or condenser is cold, then we concrete that there’s a leak point. All welding points must be checked (look for welding pints with oil) and for evaporator check we recommend make “water test” (explained in next page)

IF frost is not uniform and eva-in accumulate a lot of ice, can be considered a semi-obstruction problem. In this case we recommend replace evaporator



For making “Water Test” or replace evaporator, we must follow next steps: - Disassemble condenser

- Take out suction pipe mass and keep it for assemble it later

- Carefully, put straight the suction pipe

- Cut charge pipe



- Input trough charge pipe 10BAR nitrogen pressure

- Disassemble evaporator and disconnect electric parts. - Input evaporator completely in a water tank and look for possible leak points. - Make a visual inspection of all pipes in order to find oil rests (leak symptom), and , with pressure, use water with soap spray in the welding points.

- When leak is not found, or reasons are not clear, or set was repaired but appears again the same problem, we recommend clean internal circuit with nitrogen, change evaporator and dryer and recharge again. Evaporator will be supplied with suction a capillary welded.



FOOD FROZEN IN R ROOM MODEL: - All models SYMPTOM: - Food frozen in r room PROBLEM: - Bad storage location, ambient temperatures SOLUTION: - General inspection

ACTION:

Check if the food frozen is closed to air ducts

If overcooling reason is not found, then modify R-Sensor with a 2K resistance in order to increase around 2ºC refrigerator temperature.

See attached sensor sheet in the annex Remark: This action only for automatic models



FROST IN F ROOM (SNOW PROBLEM) MODEL: - All models SYMPTOM: - frost accumulation in freezer cases (frontal part) PROBLEM: - Air cycle locked-Fan suctioning external air SOLUTION: - Weak areas heating increase

ACTION:

Check if air ducts are not closed with ice (specially return duct as picture shows)

Increase defrost time with a 2K resistance in order to increase heating radiation and avoid ice accumulation in ducts.

See attached sensor sheet in the annex Remark: This action only for automatic models

IF model is a 310/340/370 with steel heater, then apply the “return duct transfer” for avoid future obstructions



ANNEX: 1-SENSOR ERROR INDICATOR:

DISPLAY ¦++Ù LED +ÔÀ-ã-Ã³

D1 ERROR: Freezer led red off-on-off-on continuously Reasons: D-Sensor broken, shortage, or disconnected Action: - Check all connections and wiring from M-Pcb to sensor

- Check sensor resistance value comparing it with a good sensor resistance (sensor temperature must be considered).

D2 ERROR: Freezer led red off-on-on-off after 80 minutes in defrost position (defrost no good):

Reasons: Heater broken, fuse broken, M-PCB defrost relay broken, bad connections

Action: - Check connectors (contact between male and female terminal)

- Check fuse temperature continuity (0 Ohms = OK). R1 ERROR: Refrigerator led red off-on-off-on continuously

Reasons: R-Sensor broken, shortage, or disconnected Action: - Check all connections and wiring from M-Pcb to sensor

- Check sensor resistance value comparing it with a good sensor resistance (sensor temperature must be considered).

RT ERROR: Refrigerator led red off-on-on-off continuously Action: - Replace M-PCB



2- FORCED DEFROST:

- Press control button during 10 seconds:

- If freezer temperature is over 4ºC, a 30 seconds defrost will be made in order to check defrost performance - If freezer temperature is under 4ºC, defrost will be done til rise 10ºC in D-Sensor

3- SENSOR TEMPERATURE-RESISTANCE EQUIVALENCE SHEET:

TEMP K Ohms TEMP K Ohms

-21,5 83 -3,5 35-21 80,9 -3 34,3

-20,5 78,9 -2,5 33,5-20 76,9 -2 32,7

-19,5 75 -1,5 32-19 78,2 -1 31,3

-18,5 71,4 -0,5 30,6-18 69,6 0 30

-17,5 67,9 0,5 29,34-17 66,3 1 28,71

-16,5 64,7 1,5 28,08-16 63,1 2 27,47

-15,5 61,6 2,5 26,88-15 60,1 3 26,3

-14,5 58,6 3,5 25,74-14 57,2 4 25,19

-13,5 55,9 4,5 24,65-13 54,6 5 24,13

-12,5 53,3 5,5 23,62-12 52 6 23,12

-11,5 50,8 6,5 22,63-11 49,6 7 22,15

-10,5 48,7 7,5 21,69-10 47,3 8 21,24

-9,5 46,2 8,5 20,8-9 45,1 9 20,36

-8,5 44,1 9,5 19,94-8 43,1 10 19,53

-7,5 42,1 10,5 19,13-7 41,1 11 18,74

-6,5 40,3 11,5 18,35-6 39,3 12 17,98

-5,5 37,9 12,5 17,61-5 37,5 13 17,26

-4,5 36,7 13,5 16,91-4 35,8

Repair Guide for Combi Ref Demesa

Documents

Transcript of Repair Guide for Combi Ref Demesa