Troubleshooting Guide
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23*
Master
231
Slave1
232
Slave2
233
Slave3
234
Inverter Compressor DC
Link Low Voltage
Error
No.
Error Type Error Point Main Reasons
DC Voltage isn't charged
after starting relay on
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
n Error Diagnosis and Countermeasure Flow Chart
Is input voltage normal?
No
Yes
Recheck power and installation condition
Yes
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
Are there any power wire
connections normal?
No
Yes
1. Check R/S/T/N wiring conditions
→ Rewire them if abnormality found.
Is Comp PCB assembly
normal?
No
Check Comp PCB assembly IPM normality.
→ Replace Comp PCB assembly if abnormality found.
Is bridge diode normal?
No
1. Check joining condition of bridge diode and heatsink
2. Check bridge diode
→ joining again or replacing bridge diode
if abnormality found
Yes
Yes
Is converter PCB assembly
bridge diode joining condition normal?
No
Check joining condition of converter PCB assembly and
bridge diode
→ joining again if abnormality found
Yes
Is DC_Link Wire connection
condition normal?
No
1.Check Comp PCB assembly P,N connector
connection condition
2.Check Converter PCB assembly P,N connector
connection condition
3. Check wire disconnection and wiring
→ Reassemble if abnormality found
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