LG Therma V AHBW A0 Series Service Manual page 59

Display
Title
code
Inverter DC link high
28
voltage error
n Error Diagnosis and Countermeasure Flow Chart
Is input voltage normal?
Yes
Is inverter PCB assembly normal?
Yes
Recheck power and installation condition
Measuring input voltage
L N G
L N G
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Only for training and service purposes
Cause of error
Inv PCB DC link voltage
supplied over 780V
• For single phase : check L-N phase is 220V±10%
• For triple phase : check R-N, S-N, T-N phase are
No
220V±10% and R-S, S-T, T-R phase are 380V±10%
• Check connection condition and wiring if power is
abnormal
No
Replace inverter PCB assembly
Noise filter wiring
- 59 -
Trouble Shooting Guide
Check point & Normal condition
1. Input voltage abnormal (L~N)
2. ODU inverter PCB damage
(DC Link voltage sensing part)
※ It is related to "AHBW**6*0" model.
LGE Internal Use Only