LG MULTI V 5 Manual Book page 51

Error
Error Type Error Point
No.
Error No. Error Type Error Point
26*
Master
261
Slave1
Starting failure because
Inverter compressor starting Starting failure because of
Inverter compressor
262
26* of compressor abnor-
failure Error compressor abnormality
starting failure Error
Slave2
mality
263
Slave3
264
n Error Diagnosis and Countermeasure Flow Chart
No
Is installation
condition normal?
Yes
Are there any power wire No
connections normal?
Yes
Are the resistance
Between each phase and No
insulation resistance of Inverter
compressor normal?
Yes
Is compressor
No
Wire connection
condition normal?
Yes
No
Is Inverter PCB assembly normal?
Yes
Recheck power and installation condition
Copyright ©2017 LG Electronics. Inc. All right reserved.
Only for training and service purposes
100
_TROUBLE SHOOTING GUIDE BOOK
Main Reasons
Main Reasons
1. Overload operation
1. Overload operation
(Pipe clogging/Covering/EEV defect/Ref. (Pipe clogging/Covering/EEV defect/
overcharge)
Ref. overcharge)
2. Compressor damage
2. Compressor damage
(Insulation damage/Motor damage)
(Insulation damage/Motor damage)
3. Compressor wiring fault
3. Compressor wiring fault
4. ODU Comp PCB damage (CT)
4. ODU Comp PCB damage (CT)
1. Check Pipe clogging/distortion
2. Check Covering (Indoor/Outdoor Unit)
3. Check EEV connector assemble condition/normal
operation
4. Check refrigerant pressure
→ Reassemble or manage if abnormality found
1. Check R/S/T/N wiring conditions
→ Rewire them if abnormality found.
1. Check resistance between each terminal of compressor
Compressor JQC068MA* JQC048MA*
Temp. 25℃ 75℃ 25℃ 75℃
U-V 0.216 ± 7% Ω 0.258 ± 7% Ω 0.302 ± 7% Ω 0.360 ± 7% Ω
V-W 0.216 ± 7% Ω 0.258 ± 7% Ω 0.302 ± 7% Ω 0.360 ± 7% Ω
W-U 0.216 ± 7% Ω 0.258 ± 7% Ω 0.302 ± 7% Ω 0.360 ± 7% Ω
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
3. Check compressor terminal connection condition
(bad contact)
→ Reassemble if abnormality found
Check Inverter PCB assembly IPM normality
→ Replace Inverter PCB assembly
- 116 -
LGE Internal Use Only
* Measuring resistance
between each terminal of
compressor
* Compressor wire connection
Copyright ©2017 LG Electronics. Inc. All right reserved.
Only for training and service purposes
- 117 -
LGE Internal Use Only
101
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