LG MULTI V M ARNU07GTU 4 Series Svc Manual page 61

Error
Error Type
No.
Inverter Compressor DC
231
Link Low Voltage
n Error Diagnosis and Countermeasure Flow Chart
Are there any power wire
connections normal?
Yes
Is input voltage normal?
Yes
Is bridge diode normal?
Yes
Is DC_Link Wire connection
condition normal?
Yes
Is Inv. PCB
bridge diode joining condition normal?
Yes
Is Inv. PCB
normal?
Yes
Recheck power and installation condition
Error Point
DC Voltage isn't charged
after starting relay on
No
1. Check R/S/T/N wiring conditions
→ Rewire them if abnormality found.
Check
R~S/S~T/T~R phase voltage is 380V 10%
No
R~N/S~N/T~N phase voltage is 220V 10%
→ Check connection condition and wiring if power is
abnormal
1. Check joining condition of bridge diode and heatsink
No
2. Check bridge diode
→ joining again or replacing bridge diode
if abnormality found
1.Check Inv. PCB P,N connector
connection condition
No 2.Check Inv. PCB P,N connector
connection condition
3. Check wire disconnection and wiring
→ Reassemble if abnormality found
Check joining condition of Inv. PCB and bridge diode
No
→ joining again if abnormality found
Check Inv. PCB IPM normality.
No
→ Replace Inv. PCB if abnormality found.
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Troubleshooting Guide
Main Reasons
1. DC Link terminal misconnection/terminal
contact fault
2. Starting relay damage
3. Condenser damage
4. Inv. PCB damage
(DC Link voltage sensing part)
5. Input voltage low
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