Occurence Of Excessive Current In Inverter Compressor - LG multi V PLUS Service Manual

Fault diagnosis and Trouble shooting guide
Error
Error Item
Display No.
Occurrence
of excessive
21
current
in inverter
compressor
Failure Checking Method
Is compressor
insulation resistance or motor coil
resistance normal?
Is IPM input voltage normal?
Is IPM normal?
Is the outdoor unit fan normal?
Is input voltage normal?
Is terminal connection
status normal?
Check pipe clogging or refrigerant.
Meaning
Poor inverter
compressor, poor
drive of inverter
element (IPM)
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
Self-diagnosis function
Major Error Occurrence Cause
• Excessive current flows in compressor power
supply (U, V, W)
• Excessive heat of IPM
• Excessive charge of refrigerant
• Insulation breaking of compressor
• Low input voltage
• Pulled out or loose of inverter compressor
terminal
Check the outdoor unit fan.
Replace compressor.
Check or replace fuse
or bridge diode
Replace IPM.
Check input power.
Reconnect terminal.
Service Manual 267