LG UU85W U74 - Page 60

- 60 -
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Part 4 Trouble Shooting
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6.6 Troubleshooting Outdoor Error
CH 22 (Input of Over Current)
■ Error Diagnosis and Countermeasure Flow Chart
Is installation
condition normal?
No
Yes
Yes
Yes
Recheck power and installation condition
Yes
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
Is Inv. PCB
bridge diode joining condition normal?
No
Check joining condition of Inv. PCB and bridge diode
→ joining again if abnormality found
Yes
Is input voltage normal?
No
Check
R~S/S~T/T~R phase voltage is 380V 10%
R~N/S~N/T~N phase voltage is 220V 10%
→ Check connection condition and wiring if power is
abnormal
Yes
Is Inv. PCB
normal?
No
Check Inv. PCB IGBTM normality
→ Replace Inv. PCB
Are the resistance
Between each phase and
insulation resistance of Inverter
compressor normal?
No
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
Is compressor
Wire connection
condition normal?
No
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
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
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