LG LB-D1860HL Service Manual ▷ View online
Cycle Troubleshooting Guide
Trouble analysis
1. Check temperature difference between intake and discharge air and operating current.
Temp. Difference
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
Operating Current
All amount of refrigerant leaked out
Check refrigeration cycle
Check refrigeration cycle
Refrigerant leakege
Clog of refrigeration cycle
Defective compressor
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 relativery higher, temperature difference is smaller. When the room air humidity is relatively lower
temperature difference is larger.
Temperature difference between intake and discharge air depends on room air humidity. When the room air
humidity is relativery 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
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 pressure tubing and wrap it with
putty.
Suction pressure
Temperature
(Compared with
(Compared with
Cause of Trouble
Description
the normal value)
the normal value)
Defective compressor
Current is low
Defective 4-way reverse valve
Excessive amount of
High pressure does not quickly
Normal
refrigerant
rise at the beginning of
operation
operation
Insufficient amount of
Current is low
Lower
Higher
refrigerant (Leakage)
Clogging
Clogging
Current is low
High
Higher
–30–
Electronic Parts Troubleshooting Guide
: The unit does not operate.
Possible Trouble 1
–31–
YES
YES
YES
NO
YES
Is the input voltage
of transformer AC220V?
Is the input voltage
of IC01D DC14V?
Check the FUSE
and the wiring diagram.
and the wiring diagram.
Is the output voltage
of IC01D DC12V?
Is the PIN 31,32 of
MICOM. DC5V?
Exchange MICOM
YES
NO
Check the main P.C.B
pattern
pattern
NO
NO
Check the D02D~D05D
NO
YES
Exchange
the transformer
the transformer
Is shorted the
transformer output?
NO
YES
Is the output voltage
of IC02D DC5V?
NO
Exchange IC01D
Exchange IC02D
Is the output voltage
of transformer about AC14V?
Check the
5V P.C.B pattern.
5V P.C.B pattern.
–32–
Possible Trouble 2
: The indoor fan does not operate.
NO
NO
Is it the HOT
START mode?
Is IC01M operated
normally?
Check the fan motor
and connector.
(CN-MOTOR)
and connector.
(CN-MOTOR)
YES
Is the each Relay
any problem?
YES
NO
YES
It is normal operation.
Exchange IC01M
Exchange Relay
NO
YES
YES
YES
Is the LCD operated
normally?
Is the terminal of wired
Remocon T2 DC12V
Is the pin 31, 32 of
Micom DC 5V
Change the wired Remocon.
Check the wired Remocon
PCB and DC 12V pattern.
PCB and DC 12V pattern.
NO
NO
Check the parts of
communication.
communication.
Connector CN-Remo, and
terminals of wired
Remocon exactly.
terminals of wired
Remocon exactly.
Possible Trouble 3
: Wired remote controller does not operate.
–33–
Possible Trouble 4
: Ineffective Heating
YES
YES
NO
YES
Is it Heating Mode?
Does the temperature
set all right?
Change IC01M.
NO
NO
Adjust operation mode.
Adjust set temperature
Is IC01M operated
normally?
YES
Check the connector
(CN-OUT, CN-AC1.2)
(CN-OUT, CN-AC1.2)
Check RY-4Way
NO
Is 4way-valve operated?
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