LG THERMA V AHBW076A0, Service Manual, Page: 70 / 98

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Max. C/T
Input Over Current
1. Malfunction of Compressor
2. Blocking of Pipe
3. Low Voltage Input
4. Refrigerant, Pipe length, Blocked...
Display
code
Title Cause of error Check point & Normal condition
n
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 (Unit)
3. Check EEV connector assemble condition/normal
operation
4. Check refrigerant pressure
→
Reassemble or manage if abnormality found
PCB Assembly 1
power connection normal?
No
Check connection between PCB Assembly 1 and bridge
diode(misconnection, disconnection)
→
wiring again if abnormality found
Yes
Is input voltage normal?
No Check
L~N phase is 230V 15%
→
Check connection condition and wiring if power is
abnormal
Yes
PCB Assembly 1
normal?
No
Check PCB Assembly 1 IPM normality
→
Replace inverter PCB assembly
Are the resistance
Between each phase and
insulation resistance of Inverter
compressor normal?
No
1. Check resistance between each terminal of compressor
2. Check insulation resistance between compressor
terminal and pipe
→
Replace compressor if abnormality found
Is compressor
Wire connection
condition normal?
No
1. Check PCB Assembly 1 U,V,W connector
connection condition
2. Check wire disconnection and wiring
3. Check compressor terminal connection condition
(bad contact)
→
Reassemble if abnormality found
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.