LG Therma V AHBW Series Service Manual page 79

Display
Title
code
Inverter compressor over
29
current
WARNING
Before checking PCB(Inverter) 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.
n Error Diagnosis and Countermeasure Flow Chart
Check 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 PCB assembly 1
normal?
Yes
Recheck power and installation condition
Cause of error
Inverter compressor input
current is over 30A
1. Check Pipe clogging/distortion
2. Check Covering (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
(0.188 ±7%)
No
2. Check insulation resistance between compressor
terminal and pipe (over 50 MΩ)
→ Replace compressor if abnormality found
1. Check PCB assembly 1 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
No Check
U-V,V-W,W-U phase is 220~240 V ±10%
→ Check connection condition and wiring if power is
abnormal
No
Check PCB assembly 1 IPM normality
→ Replace inverter PCB assembly
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Check point & Normal condition
1. Overload operation
(Pipe clogging/Covering/EEV defect/Ref.
overcharge)
2. Compressor damage(Insulation damage/Motor
damage)
3. Input voltage low
4. ODU PCB assembly 1 damage