LG LM-3060HL Service Manual ▷ View online
Trouble analysis
1. Check temperature difference between intake and discharge air and operating current.
All amount of refrigerant leaked out.
Check refrigeration cycle.
Refrigerant leakage
Clog of refrigeration cycle.
Defective compressor
Excessive amount of refrigerant
Normal
Notice:
Temperature difference between intake and discharge air depends on room air humidity. When the room air
humidity is relatively higher, temperature difference is smaller. When the room air humidity is relatively lower
temperature difference is larger.
humidity is relatively higher, temperature difference is smaller. When the room air humidity is relatively lower
temperature difference is larger.
2. Check temperature and pressure of refrigeration cycle.
Notice:
1. The suction pressure is usually 4.5~6.0 Kg/cm
2
G at normal condition.
2. The temperature can be measured by attaching the thermometer to the low pressrue tubing and wrap it with
putty.
58
Cycle Trouble Shooting Guide
Temp. difference : approx. 0°C
Current : less than 80% of
Current : less than 80% of
rated current.
Temp. difference : approx. 8°C
Current : less than 80% of
Current : less than 80% of
rated current
Temp. difference : less than 8°C
Current : over the rated
Current : over the rated
current
Temp. difference : Over 8°C
Temperature Difference
Operating Current
Suction pressure
Temperature
(Compared with
(Compared with
Cause of Trouble
Description
the normal value)
the normal valve)
High
Defective compressor
Current is low
Normal
Excessive anount of
High pressrue does not quickly
refrigerant
rise at the beginning of operation.
Insufficient amount of
Current is low
Lower
Higher
refrigerant (Leakage)
Clogging
Current is low
Higher
59
Electronic Parts Trouble Shooting Guide
Possible Trouble 1
: The unit does not operate.
Is the trans input power
AC240V?
Is the rrans output power
about AC12V?
Is input voltage of IC4
DC12V?
Is output voltage of IC5
DC5V?
Is th reset circuit all right?
Connect CN-DISP all right?
Is the voltage No 64 of IC1
DC5V?
Check the fuse.
Check teh wiring diagram.
Check teh wiring diagram.
Is shorted
the trans output?
NO
YES
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO
Check the main P.C.B pattern.
Exchange the trans.
Exchange BD1
Exchange IC5
Check and exchange IC3
Connect CN-DISP exactly.
Check the P.C.B pattern.
Exchange PCB ASM
1. Indoor Unit
60
NO
Si
Si
NO
Si
Si
NO
NO
NO
NO
Si
NO
Si
Si
Possible Trouble 2
: Indoor Fan does not operate.
Is it the DRY mode?
Is it the HOT mode?
Is the IC3 O.K?
Is the each relay
all right?
Check the FAN MOTOR
and Connector.
Does the temperature
set all right?
Does the temperature
set all right?
Does the deicer LED blink?
Wait Max. 4mins.
Exchange the IC3.
Adjust setting temp.
Adjust setting temp.
Check the FAN MOTOR and
connector.
connector.
Exchange teh defect relay.
YES
YES
YES
YES
YES
YES
YES
61
Si
Si
NO
Si
Si
Si
NO
NO
NO
NO
Possible Trouble 3
: Air direction louver does not operate.
: Remote controller does not operate.
Is the IC2 O.K?
Exchange the IC2.
Check the P.C.B pattern.
Exchange the battery.
Check the P.C.B
pattern
pattern
Connect CN-DISP
exactly.
exactly.
Is the voltage of CN-
STEP NO.1 DC12V?
Check the step motor and
Connector.
Is the battery
consumption O.K?
Is DC 5V between
1 ans 3 of CN-DISP?
Is the connection of
CN-DISP all right?
Exchange receiver asm.
Possible Trouble 4
YES
YES
YES
YES
YES
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