Troubleshooting Guide
- 115 -
Copyright ©2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
1.Overload operation (Pipe clog-
ging/Covering/EEV defect/Ref.
overcharge)
2.Compressor damage(Insulation
damage/Motor damage)
3.Input voltage abnormal(R,S,T)
4.Power line assemble condition
abnormal
5.Inverter PCB assembly
damage(input current sensing part)
Error No.
Error Type
Error Point
Main Reasons
Inverter PCB input 3 phase power
current is over 50A(peak) for 2ms
AC input instant over cur-
rent error (Matter of soft-
ware)
73*
Master 731
Slave 732
■
Error Diagnosis and Countermeasure Flow Chart
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 inverter PCB assembly 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 R,S,T connection condition
2.Check wire disconnection and wiring
→
Reassemble if abnormality found
Is inverter PCB assembly
normal?
Yes
No
Recheck power and
installation condition
Yes
Yes
Yes
No
No
Yes
No
Check
R~S/S~T/T~R Phase voltage : 460V
±
10% (3Ø 460V)
208/230V
±
10% (3Ø 208/230V)
→
Check connection condition and wiring if power is abnormal
Is input voltage normal?
Check inverter PCB assembly IPM normality
→
Replace inverter PCB assembly
Summary of Contents for ARUN Series
Page 134: ...P NO MFL50459503 MAY 2008 ...
