LG AMNW07GDBL1 Service Manual page 89

Part 5. Trouble Shooting
Display
Title
code
Inverter compressor over
29
current
WARNING
Before checking PCB or each outdoor electric parts, wait for 3 minutes after the power is off. When measuring at standby state
of power supply, after checking the measurement mode of the meter, be careful of the short-circuits with other parts.
■ Error Diagnosis and Countermeasure Flow Chart
Is installation
condition normal?
Yes
Are the resistance
Between each phase and
insulation resistance of Inverter
compressor normal?
Yes
Is compressor
Wire connection
condition normal?
Yes
Is input voltage normal?
Yes
Is inverter PCB assembly
normal?
Yes
Recheck power and installation condition
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Only for training and service purposes
Cause of error
Inverter compressor input
current is over 30A
1. Check Pipe clogging/distortion
2. Check Covering (Indoor/Outdoor Unit)
No
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
(0.438~0.628±7%)
No
2. Check insulation resistance between compressor
terminal and pipe (over 2M
→
Replace compressor if abnormality found
1. Check inverter PCB assembly U,V,W connector
connection condition
2. Check wire disconnection and wiring
No
3. Check compressor terminal connection condition
(bad contact)
→
Reassemble if abnormality found
No Check
L~N phase is 230V±15%
→
Check connection condition and wiring if power is
abnormal
No
Check inverter PCB assembly IPM normality
→
Replace inverter PCB assembly
- 88 -
Check point & Normal condition
1. Overload operation
(Pipe clogging/Covering/EEV defect/Ref. over-
charge)
2. Compressor damage(Insulation damage/Motor
damage)
3. Input voltage low
4. ODU inverter PCB assembly damage
)
Ω
LGE Internal Use Only