LG LS-J0761NL_NM_NN / LS-J0962NL_NM_NN / LS-L1261NL_NM_NN 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.
• Refrigerant leakege
Clog of refrigeration cycle
Defective compressor
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 4.0~6.0 kg/cm
1. The suction pressure is usually 4.0~6.0 kg/cm
2
G(Cooling) 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 valve)
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
Current is low.
High
Higher
-51-
-52-
1. The malfunction indicator of indoor (see the operating LED of the INDOOR)
Self-diagnosis function
The cause of malfunction
Error
Code
1
Indoor TH. is short or open.
Outdoor TH. is short or open.
Temp. of Heat sink is over
84°C.
84°C.
Comunication error (serial
comunication).
comunication).
DC peak error.
Running current is
overloaded.
overloaded.
The operating LED will be
blinking once.
blinking once.
The operating LED will be
blinking twice.
blinking twice.
The operating LED will be
blinking 4 times.
blinking 4 times.
The operating LED will be
blinking 5 times.
blinking 5 times.
The operating LED will be
blinking 6 times.
blinking 6 times.
The operating LED will be
blinking 7 times.
blinking 7 times.
Keep operating state.
Keep operating state.
Restart compressor when OLP TH
Temp is 74°C below.
Temp is 74°C below.
The operation is off(enable to restart
by remote controller).
by remote controller).
Compressor will be turned off
immediately.
immediately.
Compressor will be turned off
immediately.
immediately.
Malfunction indicator
The operating state
2. The malfunction indicator of outdoor (see the LED01M on the outdoor PCB ass’y)
The cause of malfunction
Indoor TH. is short or open.
Temp. of Heat sink is over 84°C.
Comunication error (serial
comunication).
comunication).
DC peak error.
Running current is
overloaded.
overloaded.
Comp. dome TH is short or
open.
open.
The LED01M will be blinking
twice.
twice.
The LED01M will be blinking 4
times.
times.
The LED01M will be blinking 5
times.
times.
The LED01M will be blinking 6
times.
times.
The LED01M will be blinking 7
times.
times.
The LED01M will be blinking 10
times.
times.
Keep operating state.
Restart comp. on in the OLP short
state.
state.
The operation is off(enable to restart
by remote controller).
by remote controller).
Compressor will be turned off
immediately.
immediately.
Compressor will be turned off
immediately.
immediately.
Compressor will be turned off
immediately.
immediately.
Malfunction indicator
The operating state
❈
Error code
➅
,
➆
can’t be operated unless the power cord is removed.
2
4
5
6
7
2
4
5
6
7
10
Error
Code
-53-
■
Precaution in Service or Check
Even after stopping the operation of product, it takes some time to discharge the remaining electricity of the
electrolytic capacitor that was charged. Before starting a checking or repairing job, pull out the plug out of the
outlet and make sure that the lamp on the control board outdoor unit is off.
electrolytic capacitor that was charged. Before starting a checking or repairing job, pull out the plug out of the
outlet and make sure that the lamp on the control board outdoor unit is off.
■
The Diagnosis Procedure
Check the supplied voltage to product (AC 220V/240V ± 30V).
Check the connecting cable between Indoor and Outdoor.
Check the blinking number of operation indicator (refer to the self-error function).
Check the self-diagnosis table
• Check the condition of connectors
• The condition of P.C.B pattern.
• The condition of P.C.B pattern.
• Check the condition of connectors.
• The condition of P.C.B pattern.
• The electronic components.
• The condition of P.C.B pattern.
• The electronic components.
Indoor Outdoor
Electronic Parts Troubleshooting Guide
-54-
❇
Refer to electronic contorol device drawing & schematic diagram.
The Product doesn’t operate at all.
Turn off the main power and wait to 5 seconds
Turn on the main power again.
Does "Beeping" sound is made from the indoor unit?
• Primarily, the operating
condition of Micom is O.K.
• Check CN-DISP1
CN-DISP2
Check the voltage of power(AC220V/AC240V, 50Hz).
• The voltage of main power.
• The voltage applied to the unit.
• The connecting method of Indoor/Outdoor connecting cable (each color)
• The P.W.B. Ass'y
(Fuse, Noise Filter, Power Transformer, Bridge Diode, etc.)
• The voltage applied to the unit.
• The connecting method of Indoor/Outdoor connecting cable (each color)
• The P.W.B. Ass'y
(Fuse, Noise Filter, Power Transformer, Bridge Diode, etc.)
Trouble 1
NO
YES
The operation check of the P.C.B. Ass'y
Procedure
1) The input voltage of power
transformer.
2) The output voltage of power
transformer.
3) IC01D(7812)
4) IC02D(7805)
5) IC01A(KIA7036)
Specification
1) AC230V ± 30V
: Check the rated voltage
2) 14V ± 3V
3) DC12V
4) DC5V
5) The voltage of micom pin 29
: DC4.5V
↑
Remedy
1) Replace
power transfomer.
2) Replace
power transfomer.
3) Replace IC01D.
4) Replace IC02D.
5) Replace IC01A.
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