LG Multi V ARWM072CAS5 Service Manual page 115

Error
Error Type
No.
23*
Master
231
Inverter Compressor DC
Slave1
Link High / Low Voltage
232
Slave2
233
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 Inverter PCB assembly
bridge diode joining condition normal?
Yes
Is Inverter PCB assembly
normal?
Yes
Recheck power and installation condition
Error Point
DC Voltage isn't charged
after starting relay on
No 1. Check R(L1)/S(L2)/T(L3) wiring conditions
→ Rewire them if abnormality found.
Check
No R~S/S~T/T~R phase voltage is 575 V±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 Inverter PCB assembly P,N connector
No
connection condition
2. Check wire disconnection and wiring
→ Reassemble if abnormality found
Check joining condition of Inverter PCB assembly and
No
bridge diode
→ joining again if abnormality found
Check Inverter PCB assembly IPM normality.
No
→ Replace Inverter PCB assembly if abnormality found.
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Self-diagnosis function
Main Reasons
1. DC Link terminal misconnection/terminal
contact fault
2. Condenser damage
3. Inverter PCB assembly damage
(DC Link voltage sensing part)
4. Input voltage High / Low
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