LG UU85W U74 - Page 67

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Flow of trouble diagnosis
6.6 Troubleshooting Outdoor Error
CH 26 (Compressor Starting Failure)
Is installation
condition normal?
No
Yes
Yes
Recheck power and installation condition
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 resistance between each terminal of
compressor (Refer to the right side tables.)
2. Check insulation resistance between compressor
terminal and pipe (over 50m)
→ Replace compressor if abnormality found
Are the resistance
Between each phase and
insulation resistance of Inverter
compressor normal?
No
Yes
No
Yes
1. Check Inv. PCB U,V,W connector
connection condition
2. Check wire disconnection and wiring
3. Check compressor terminal connection condition
(bad contact)
→ Reassemble if abnormality found
Is compressor
Wire connection
condition normal?
No
Yes
Check Inv. PCB IGBTM normality
→ Replace Inv. PCB
Is Inv. PCB normal?
No
Are there any power wire
connections normal?
1. Check R/S/T/N wiring conditions
→ Rewire them if abnormality found.
Temp 25°C 75°C
U-V 0.163 ± 7% Ω 0.195 ± 7% Ω
V-W 0.163 ± 7% Ω 0.195 ± 7% Ω
W-U 0.163 ± 7% Ω 0.195 ± 7% Ω
JBA068MAF