LG MULTI V IV ARNU07GTU 2 Series Service Manual page 92

Troubleshooting Guide
Error
Error Type
No.
23*
Master
231
Slave1
Inverter Compressor DC
232
Link Low Voltage
Slave2
233
Slave3
234
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 converter PCB assembly
bridge diode joining condition normal?
Yes
Is Comp PCB assembly
normal?
Yes
Recheck power and installation condition
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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 Comp PCB assembly P,N connector
connection condition
No 2.Check Converter PCB assembly P,N connector
connection condition
3. Check wire disconnection and wiring
→ Reassemble if abnormality found
Check joining condition of converter PCB assembly and
No
bridge diode
→ joining again if abnormality found
Check Comp PCB assembly IPM normality.
No
→ Replace Comp PCB assembly if abnormality found.
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Main Reasons
1. DC Link terminal misconnection/terminal
contact fault
2. Starting relay damage
3. Condenser damage
4. Comp PCB assembly damage
(DC Link voltage sensing part)
5. Input voltage low
LGE Internal Use Only