LG THERMA V AHBW076A0, Service Manual, Page: 77 / 98

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AC Input Instant over
Current Error
PCB(Inverter) input
current is over
100A(peak) for 2us
1. Overload operation (Pipe clogging/Covering/EEV
defect/Ref. overcharge)
2. Compressor damage (Insulation damage/Motor
damage)
3. Input voltage abnormal (L,N)
4. Power line assemble condition abnormal
5. PCB assembly 1 Damage
(input current sensing part)
Display
code
Title Cause of error Check point & Normal condition
h
PFCM Moudle checking method
①
Set the multi tester to diode mode.
②
Check short between input signal pin which are
placed below PFC Module
③
Replace PCB assembly 1 if it is short between pins
except No.4,5 pins.
CAUTION
PFCM module No.4,5 pins are internal short state.
No
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 installation
condition normal?
Is compressor
Wire connection
condition normal?
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
Is AC input Wire connection
condition normal?
1.Check L,N connection condition
2.Check wire disconnection and wiring
→
Reassemble if abnormality found
Is PCB assembly 1
normal?
Yes
No
Recheck power and
installation condition
Yes
Yes
Yes
No
No
Yes
No
Check
L~N phase voltage is 230V ± 15%
→
Check connection condition and wiring if power is abnormal
Is input voltage normal?
Check PCB assembly 1 PFCM normality
→
Replace PCB assembly 1
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