108 109
_TROUBLE SHOOTING GUIDE BOOK _
- 125 -
Copyright ©2017 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
n
Error diagnosis and countermeasure flow chart
Sensor connection to PCB
is normal?
Is the resistance of
sensor normal?*
Insert sensor connector to PCB properly
Replace sensor
Replace corresponding outdoor PCB
Yes
No
No
Is sensor resistance
value same as temperature
value of LGMV?
Yes
Yes
No
Replace corresponding sensor
* Error is generated if the resistance is more than 5 MΩ(open) and less than 2 kΩ (short)
Note: Standard values of resistance of sensors at different temperatures (5% variation)
10°C = 362kΩ : 25°C= 200kΩ : 50°C= 82kΩ : 100°C= 18.5kΩ
Check the resistance
inverter compressor
discharge temperature
Error No. Error Type Error Point Main Reasons
41*
(Inverter1)
Master 411
Slave1 412
Slave2 413
Slave3 414
Compressor1 dis-
charge pipe tempera-
ture sensor error
Sensor measurement
value is abnormal
(Open/Short)
1. Defective connection of the compressor1 discharge
pipe temperature sensor
2. Defective discharge pipe compressor sensor of the
compressor1 (open/short)
3. Defective outdoor PCB
47*
(Inverter2)
Master 471
Slave1 472
Slave2 473
Slave3 474
Compressor2 dis-
charge pipe tempera-
ture sensor error
Sensor measurement
value is abnormal
(Open/Short)
1. Defective connection of the compressor1 discharge
pipe temperature sensor
2. Defective discharge pipe compressor sensor of the
compressor1 (open/short)
3. Defective outdoor PCB
Error No. Error Type Error Point Main Reasons
41*
Compressor1
discharge pipe
temperature sensor
error
Sensor measurement
value is abnormal
(Open/Short)
1. Defective connection of the compressor1
discharge pipe temperature sensor
2. Defective discharge pipe compressor sensor
of the compressor1 (open/short)
3. Defective outdoor PCB
47*
Compressor2
discharge pipe
temperature sensor
error
Sensor measurement
value is abnormal
(Open/Short)
1. Defective connection of the compressor1
discharge pipe temperature sensor
2. Defective discharge pipe compressor sensor
of the compressor1 (open/short)
3. Defective outdoor PCB
- 124 -
Copyright ©2017 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
40*
Master
401
Slave1
402
Slave2
403
Slave3
404
Inverter compressor CT
sensor error
Error
No.
Error Type Error Point Main Reasons
Micom input voltage isn't
within 2.5V ±0.3V at initial
state of power supply
1. Input voltage abnormal (T-N)
2. DC power part damage (DC 5V)
3. Outdoor unit’s inverter PCB damage
(CT sensing part)
n
Error Diagnosis and Countermeasure Flow Chart
Is input voltage normal?
No
Yes
Recheck power and installation condition
Check
R~S/S~T/T~R phase voltage is 380V±10%
R~N/S~N/T~N phase voltage is 220V±10%
→ Check connection condition and wiring if power is
abnormal
Is Inverter PCB assembly normal?
No
Yes
Replace Inverter PCB assembly
* Measuring input voltage
* Inverter PCB assembly
1. Check R/S/T/N wiring conditions
2. Check Noise filter wiring conditions
→ Rewire them if abnormality found.
No
Yes
Are there any power wire
connections normal?
R(L1) S(L2) T(L3) N
Error No. Error Type Error Point Main Reasons
40*
Inverter compressor
CT sensor error
Micom input voltage
isn't within 2.5V
±0.3V at initial state
of power supply
1. Input voltage abnormal (T-N)
2. DC power part damage (DC 5V)
3. Outdoor unit's inverter PCB damage
(CT sensing part)
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