LG MULTI V Service Manual page 117

Error
Error Type
No.
Inverter compressor starting
26
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 Inv. PCB 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 L1(L)/L2(N) wiring condition
→ Rewire them if abnormality found.
1. Check resistance between each terminal of
compressor (Refer to the right side tables.)
2. Check insulation resistance between compressor
No
terminal and pipe (over 50 m)
→ Replace compressor if abnormality found
1. Check Inv. PCB U,V,W connector
connection condition
No
2. Check wire disconnection and wiring
3. Check compressor terminal connection condition
(bad contact)
→ Reassemble if abnormality found
Check Inv. PCB IPM normality
No
→ Replace Inv. PCB
- 117 -
Self-diagnosis function
Main Reasons
1. Overload operation
(Pipe clogging/Covering/EEV defect/Ref.
overcharge)
2. Compressor damage
(Insulation damage/Motor damage)
3. Compressor wiring fault
4. Inv. PCB damage (CT)
JQC048MBC
Temp.
U-V
V-W
W-U
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All rights reserved. Only training and service purposes.
25 ℃[77 ℉] 75 ℃[167 ℉]
0.113±7 %Ω 0.135±7 %Ω
0.113±7 %Ω 0.135±7 %Ω
0.113±7 %Ω 0.135±7 %Ω