LG MULTI V IV ARNU07GTU 2 Series Service Manual page 99

Error
Error Type
No.
29*
Master
291
Slave1
Inverter compressor over
292
current
Slave2
293
Slave3
294
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 Comp 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/Outdoor 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
(U-V:0.255 ±7%, V-W:0.255 ±7%, W-U:0.255 ±7%(75℃)
No
2.Check insulation resistance between compressor terminal
and pipe (over 50M )
→ Replace compressor if abnormality found
1. Check Comp 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
abnormal
Check Comp PCB assembly IPM normality
No
→ Replace Comp 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 Comp PCB assembly damage
LGE Internal Use Only