LG ARWN038GA2 Service Manual page 61

Error
Error Type
No.
Inverter compressor over
29*
current
■ Error Diagnosis and Countermeasure Flow Chart
Is installation
condition normal?
Yes
Are the resistance
Between each phase and
insulation resistance of Inverter
compressor normal?
Yes
Is compressor
Wire connection
condition normal?
Yes
Is input voltage normal?
Yes
Is inverter PCB assembly normal?
Yes
Recheck power and installation condition
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Error Point
Inverter compressor input
current is over 30A
1. Check Pipe clogging/distortion
2. Check Covering (Indoor/outside Unit)
No
3. Check EEV connector assemble condition/normal
operation
4. Check refrigerant pressure
' Reassemble or manage if abnormality found
1.Check resistance between each terminal of compressor
(0.34~0.35 7%)
No
2.Check insulation resistance between compressor terminal
and pipe (over 50M )
→ Replace compressor if abnormality found
1. Check inverter PCB assembly U,V,W connector
connection condition
No
2. Check wire disconnection and wiring
3. Check compressor terminal connection condition
(bad contact)
→ Reassemble 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
abnorma
Check inverter PCB assembly IPM normality
No
→ Replace inverter PCB assembly
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Troubleshooting Guide
Main Reasons
1. Overload operation
(Pipe clogging/Covering/EEV defect/Ref.
overcharge)
2. Compressor damage (Insulation
damage/Motor damage)
3. Input voltage low
4. ODU inverter PCB assembly damage
LGE Internal Use Only