No
No
Is compressor
insulation resistance or motor coil
resistance normal?
Replace compressor.
Check or replace fuse
or bridge diode
Replace IPM.
Check the outdoor unit fan.
Check input power.
Reconnect terminal.
Yes
Yes
Yes
No
Yes
No
No
Yes
Yes
No
Is IPM input voltage normal?
Is IPM normal?
Is the outdoor unit fan normal?
Is input voltage normal?
Check pipe clogging or refrigerant.
Is terminal connection
status normal?
Failure Checking Method
Fault diagnosis and Trouble shooting guide
Occurrence
of excessive
current
in inverter
compressor
21
• 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
Poor inverter
compressor, poor
drive of inverter
element (IPM)
Error Item
Error
Display No.
Major Error Occurrence CauseMeaning
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