LG MULTI V M ARNU07GTU 4 Series Svc Manual page 66

Troubleshooting Guide
Error
Error Type
No.
Inverter compressor over
291
current
n 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 Inv. PCB normal?
Yes
Recheck power and installation condition
Error Point
Inverter compressor input
current is over 30A
1. Check Pipe clogging/distortion
2. Check Covering (Indoor/Compressor Module)
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 (Refer to the right side tables.)
No
2. Check insulation resistance between compressor
terminal and pipe (over 50m)
→ Replace compressor if abnormality found
1. Check Inv. PCB 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 abnormal
Check Inv. PCB IPM normality
No
→ Replace Inv. PCB
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Main Reasons
1. Overload operation
(Pipe clogging/Covering/EEV defect/Ref.
overcharge)
2. Compressor damage(Insulation
damage/Motor damage)
3. Input voltage low
4. Inv. PCB damage
RJA036MAA
Temp
U-V 0.529 ± 7% Ohms 0.631 ± 7% Ohms
V-W 0.529 ± 7% Ohms 0.631 ± 7% Ohms
W-U 0.529 ± 7% Ohms 0.631 ± 7% Ohms
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