LG MULTI V IV ARNU07GTU 2 Series Service Manual page 96

Troubleshooting Guide
Error
Error Type
No.
26*
Master
261
Slave1
Inverter compressor starting
262
failure Error
Slave2
263
Slave3
264
n Error Diagnosis and Countermeasure Flow Chart
Is installation
condition normal?
Yes
Are there any power wire
connections normal?
Yes
Are the resistance
Between each phase and
insulation resistance of Inverter
compressor normal?
Yes
Is compressor
Wire connection
condition normal?
Yes
Is Comp PCB assembly normal?
Yes
Recheck power and installation condition
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Error Point
Starting failure because of
compressor abnormality
1. Check Pipe clogging/distortion
2. Check Covering (Indoor/Outdoor Unit)
3. Check EEV connector assemble condition/normal
No
operation
4. Check refrigerant pressure
→ Reassemble or manage if abnormality found
No 1. Check R/S/T/N wiring conditions
→ Rewire them 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
2. Check wire disconnection and wiring
No
3. Check compressor terminal connection condition
(bad contact)
→ Reassemble if abnormality found
Check Comp PCB assembly IPM normality
No
→ Replace Comp PCB assembly
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Main Reasons
1. Overload operation
(Pipe clogging/Covering/EEV defect/Ref.
overcharge)
2. Compressor damage
(Insulation damage/Motor damage)
3. Compressor wiring fault
4. ODU Comp PCB damage (CT)
LGE Internal Use Only