LG LWC1262ACG_N_P / LWC1262PCG_N_P / LWC1262BCG_N_P / LWC1262QCG_N_P / LWC1262AHG_E / LWC1262PHG_E Service Manual ▷ View online
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4.3 TROUBLESHOOTING GUIDE
In general, possible trouble is classified in two kinds.
The one is called Starting Failure which is caused from an electrical defect, and the other is ineffective Air
Conditioning caused by a defect in the refrigeration circuit and improper application.
The one is called Starting Failure which is caused from an electrical defect, and the other is ineffective Air
Conditioning caused by a defect in the refrigeration circuit and improper application.
Unit runs but poor cooling.
Ineffective Cooling
Check outdoor coil
(heat exchanger) & the fan
operation.
(heat exchanger) & the fan
operation.
Check gas leakage.
Repair gas leak.
Replacement of unit if the
unit is beyond repair.
unit is beyond repair.
Satisfactory operation with
temperature difference of
inlet & outlet air ;
44~50
temperature difference of
inlet & outlet air ;
44~50
°
F(7~10
°
C)
Check heat load
increase.
increase.
Clean condenser.
Not on separate circuit.
Check inside gas
pressure.
pressure.
Adjusting of refrigerant
charged.
charged.
Malfunction of compressor.
Replacement of
compressor.
compressor.
Check cold air circulation
for smooth flow.
for smooth flow.
Dirty indoor coil
(Heat exchanger)
(Heat exchanger)
Stop of auto air-swing
Correct above trouble
Check clogging in refrigera-
tion circuit.
tion circuit.
Repair clogging in refrigera-
tion circuit.
tion circuit.
Obstruction at air outlet
Clogged of air filter.
Malfunction of fan
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Fails to Start
Check circuit breaker
and fuse.
and fuse.
Gas leakage of feeler bulb
of thermostat
of thermostat
Check of control switch.
Fan only fails to start.
Improper wiring.
Defect of fan motor
capacitor.
capacitor.
Irregular motor resistance
( ).
Irregular motor insulation
( ).
( ).
Irregular motor insulation
( ).
Replacement of fan motor.
Regular but fails to start.
Replacement of compressor
(locking of rotor, metal).
(locking of rotor, metal).
Improper thermostat setting.
Loose terminal connection.
Improper wiring.
Irregular motor resistance ( )
Irregular motor insulation ( )
Replacement of compressor
(Motor damaged)
(Motor damaged)
Drop of power voltage.
Capacitor check.
Replacement
Compressor only fails to
start.
start.
Defect of compressor
capacitor.
capacitor.
Check of power source.
Check of control switch
setting.
setting.
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• Check the Fuse.
• Check the wiring diagram.
• Check the wiring diagram.
Is the Trans input power
AC 220/240V?
Is the Trans output power
about AC 13V?
Is shorted the Trans. output?
Is output Voltage of IC01D
DC 12V?
Is output Voltage of IC02D
DC 5V?
Is the voltage No.20 of Micom
DC 5V?
Exchange Main PCB Ass'y.
Is the
connection between
Main and Display
all right?
Is the reset circuit all right?
(The No.16 of
Micom is 5V.)
• Check the Fuse.
• Check the wiring diagram.
• Check the wiring diagram.
• Check the Main
PCB pattern.
PCB pattern.
• Exchange the Trans.
• Exchange D02D~D05D.
• Exchange IC01D.
• Exchange IC01D.
• Exchange IC02D.
• Exchange IC01A, C02A.
• Connect connector
exactly.
exactly.
• Check the PCB
pattern.
pattern.
NO
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES
NO
YES
■
ELECTRICAL PARTS TROUBLESHOOTING GUIDE:
LWC1262PCG/N/P, LWC1262QCG/N/E
LWC1262PCG/N/P, LWC1262QCG/N/E
Possible Trouble 1
The unit does not operate.
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Possible Trouble 2
The compressor does not operate.
Possible Trouble 3
The compressor always operate.
Is setting
Temp. set lower than Room
Temp.-0.5
°
C?
Is the voltage No.11
of IC01M 0V?
• Exchange IC01M.
• Select the setting Temp. to lower Number.
• Wait 3 Minutes.
Is the Unit for 3 minutes
delay?
• Exchange MAIN
PCB Ass'y.
PCB Ass'y.
Is the voltage N0.6 of
IC01M DC 5V?
• Check the RY-COMP.
• Check the wiring
Diagram.
Diagram.
NO
NO
NO
YES
YES
YES
YES
Is the wire connection of
RY-COMP all right?
• Check the RY-COMP.
• Connect LEAD Wire to
RY-COMP again.
RY-COMP again.
NO
YES
NO
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