SERVICE MANUAL MR-G57N-T-NZ - B.d.t.

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Inverter-related indication “Compressor does not operate” Error code Abnormality Possible cause Symptom Treatment E56 •Defective wiring continuity •Trouble of the control board Compressor Point+2 (to measure resistance) For checking the connection to compressor E57 Lead wires connected to compressor Inverter drive module abnormality •Defective connection of connectors related to compressor(boardside,relay,compside) •Defective wiring connecting of the compressor •Trouble of control board •Trouble of compressor 6-pin wire to wire connector in machine chamber Point+1 (to measure resistance) For checking the wire to wire connection condition. (1) or (2) (1) Compressor cannot be activeted for more than 1.5 hours (2) Overcurrent detection error occurred before the compressor is actived. Control board Failure of the Excess current inverter drive mod- is detected in the inverter drive ule in the control module before P.C. board starting the compressor, and the compressor does not start rotating. 1. Locate the trouble and decide the treatment •Decide the treatment by checking the followings. (1) Defective connector connections. (board-side, wire to wire, comp-side) (2) Resistance of compressor’s winding 2. Flowchart of troubleshooting 3. Recheck after treatment •After any treatment is tried, unplug and plug power cord again to check if the compressor operates properly. •If the compressor can operate properly for more than 1 minute after power cord is plugged again, it’s presumed that the cause of trouble is eliminated. *If the cause of trouble cannot be eliminated, E56 will be displayed again 1 minute later after the power cord is plugged again. *If the control board has been replaced, E56 won’t be displayed even though the cause of trouble is still not eliminated. In such a case, perform the ice making test operation to check what the error is. At the same time, also confirm that the compressor is operating for more than 3 minutes and each compartment is getting cooled. 30 start Connector CN50G on the control board is properly connected? 6-pin wire to wire connector in machine chamber is properly connected? The connector of compressor is properly connected? Disconnect 6-pin wire to wire connector in machine chamber and measure the resistance between each terminal of and (Pont 1). Approx. Is compressor being energized at startup? Exchange the unit Yes Yes Yes No Check Yes Yes Yes No No Replace the control board. No No Connect properly. No Exchange the unit Replace the lead wire connected to compressor. Replace the control board. Treatment Replace it only when error display keeps blinking even though all the above mentioned connectors are properly connected.
Poor defrosting [4] The refrigerator fan motor does not work [5] 1 Short-circuit the terminal and of the compulsory defrosting terminals (CN1M) of the control board to actuate the compulsory defrosting function and check whether the defrost heater is working properly. *1 2 Check if there is conduction between thermal fuse and defrost heater. 1 Control board CN7S CN2A Doors 3-Pin connector Between 1 and 3 No Yes No 4-pin connector 1-pin connector 2 Unplug and plug the power cord to check if machine chamber fan motor is rotating. 3 5 2-pin connector 31 Poor cooling No Room light is turned on and off properly. Any one of the doors are open OFF etc 2 -pin connector Yes (heats up) Thermal fuse Defrost heater Defrost thermistor Room light is not turned on and off. Door switch for refrigerator compartment (right and left) and ice making compartment. Control board Unplug and plug the power cord to perform self-check on refrigerator fan motor. Is the display indicating abnormality? Running Check the door switch for conduction. •Open and close the refrigerator door several times and check if the room light will be turned on and off (Room light should get turned off when the door comes 10mm close to the refrigerator body .) •Close the refrigerator compartment door until the light is turned off . Open and close the ice-making-compartment door , and from the space of refrigerator compartment door, check that the room light is turned on and off. Check if there is continuity in 4-pin fan motor connector in versa compartment. CN7S CN4D 8-pin connector 4-pin connector R-door (right, left): closed Door of the ice making compartment : closed 1 2 ON Reed Switch board 3-pin connector 2-pin connector 4-pin connector Yes Not rotating Conduction detected No conduction Refrigerator compartment (right and left)/ Ice making compartment door switch Freezer compartment door switch Refrigerator fan motor 4 Check the conduction by disconnecting the CN7S on the control board. (See figure below.) Check the following and explain the result: half-open door, space between gaskets, the amount of ice. Replace the defrost heater and the thermal fuse. Check the resistance of the defrost thermistor. Normal Short circuit CN1M Compulsory defrosting *1 The compulsory defrosting will not work when the temperature of the defrost thermistor is 14°C or more. Replace refrigerator fan motor. Note: Refrigerator fan motor is combined with fan grille. Check if CN4D connector on control board is connected properly. If it is, replace the control board. Abnormal Contact failure of connector. Connect it properly. Check if the connector on the door switch is connected properly. If it is, replace the door switch. Connect the connectors properly. Replace refrigerator fan motor. Note: Refrigerator fan motor is combined with fan grille. If any one of those doors are open, the switch between and , terminals of 3-pin connector, will be OFF) 5~10mm Left door of refrigerator comparttment Door of ice making compartment 1 Right door of refrigerator compartment Door of versa compartment Door of vegetable compartment Door of freezer compartment
Page 1: HOME REFRIGERATOR SERVICE MANUAL Mo
Page 4 and 5: 2 SPECIFICATIONS MR-G57N-NZ Accesso
Page 6 and 7: 3 MR-G57N-NZ WIRING DIAGRAM I.THERM
Page 8 and 9: 4 MR-G57N-NZ 86 203 196 OUTLINES AN
Page 10 and 11: 6 TROUBLESHOOTING 6-1 FUNCTION OF O
Page 12 and 13: (5) Service Check Function 1) Outli
Page 14 and 15: 3) Damper Operation Mode Setting Wi
Page 16 and 17: 4) Thermistor temperature check mod
Page 18 and 19: Switching over the mode Press to se
Page 20 and 21: (3) Select the adjustment level of
Page 22 and 23: (2) Timing in self-check Trouble of
Page 24 and 25: Display Error Display code Tens' pl
Page 26 and 27: (3) Operation by ice making test Pr
Page 28 and 29: Freezer compartment [2] Compressor
Page 32 and 33: Vegetable compartment [6] Is the te
Page 34 and 35: 6-6 TROUBLE CRITERION OF MAIN PARTS
Page 36 and 37: Components/ Part Name Vegetable com
Page 38 and 39: Components/ Part Name Three-way val
Page 40 and 41: 6-8 TEST POINT DIAGRAM OF CONTROL B
Page 42 and 43: 8 DISASSEMBLY INSTRUCTIONS MR-G57N-
Page 44 and 45: OPERATING PROCEDURE PHOTOS Control
Page 46 and 47: OPERATING PROCEDURE PHOTOS Evaporat
Page 48 and 49: OPERATING PROCEDURE 5. Parts inside
Page 50 and 51: OPERATING PROCEDURE 9. Compressor c
Page 52: Door adjustment • Common element

SERVICE MANUAL MR-G57N-T-NZ - B.d.t.

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