LG LW-C0960HL Service Manual ▷ View online
17
4.3 TROUBLESHOOTING GUIDE
In general, possible trouble is classified in two causes.
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 or heating.
Ineffective Cooling or Heating
Check of 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 ;
COOLING : 7~10°C
HEATING : 15~17°C
temperature difference of
inlet & outlet air ;
COOLING : 7~10°C
HEATING : 15~17°C
Check heat load increase in
cooling operation.
cooling operation.
Unexpected residue
Added heat load
Check of inside gas
pressure
pressure
Adjusting of refrigerant
charge
charge
Malfunction of compressor
Replacement of
compressor
compressor
Check of cold (warm) air cir-
culation for smooth flowing
culation for smooth flowing
Dirty indoor coil
(Heat exchanger)
(Heat exchanger)
Malfunction of fan
Clogged of air filter
Obstruction at air outlet
Countermeasure against
above trouble.
above trouble.
Check clogging in refrigera-
tion circuit.
tion circuit.
Repair clogging in refrigera-
tion circuit.
tion circuit.
18
Fails to start.
Check of circuit breaker
and fuse
and fuse
Gas leakage of feeler bulb
of thermostat
of thermostat
Check of control switch
Only fan 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
Only compressor fails to
start.
start.
Defect of compressor
capacitor
capacitor
Check of power source
Check of control switch
setting
setting
19
Electrical Parts Troubleshooting Guide (LW-C0961HL/C1261HL)
Possible Trouble 1
The unit does not operate.
Is the Trans output power
AC 220V?
Is the Trans output power
about AC 13V?
Is shorted the Trans. output?
Is output Voltage of IC2
DC 12V?
Is output Voltage of IC3
DC 5V?
Is the voltage No.20 of IC1
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
IC1 is 5V.)
• Check the Fuse.
• Check the wiring diagram.
• Check the wiring diagram.
• Check the Main
PCB pattern.
PCB pattern.
• Exchange the Trans.
• Exchange BD1.
• Exchange IC2.
• Exchange IC3.
• Exchange IC4, C07.
• 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
20
Possible Trouble 2
The compressor does not operate.
Is setting
Temp. set lower than Room
Temp.-0.5°C?
Is the voltage No.10
of IC7 0V?
• Exchange IC7.
• 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 N0.7 of
IC 7 DC 5V?
• Check the RY-COMP.
• Check the wiring
Diagram.
Diagram.
NO
NO
NO
NO
YES
YES
YES
YES
Possible Trouble 3
The compressor always operate.
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
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