LG ACHH Series Manual page 68

Error code check
Error
Error Type
No.
26
Inverter compressor starting
(261)
failure Error
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 inverter PCB assembly normal?
Yes
Recheck power and installation condition
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 wiring conditions
→ Rewire them if abnormality found.
1. Check resistance between each terminal of compressor
Compressor
No
2. Check insulation resistance between compressor
terminal and pipe (over 50 M)
→ Replace compressor if abnormality found
1. Check inverter PCB assembly U,V,W connector
No
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
No
→ Replace inverter PCB assembly
Measuring resistance between
each terminal of compressor
- 68 -
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 inverter PCB damage (CT)
JQC068MA*
Temp. 25℃
U-V 0.216 ± 7% Ω 0.258 ± 7% Ω
V-W 0.216 ± 7% Ω 0.258 ± 7% Ω
W-U 0.216 ± 7% Ω 0.258 ± 7% Ω
*Compressor wire connection
75℃