LG MULTI V 5 Manual Book page 55

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