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9 IPM malfunction or IGBT over-strong current protection diagnosis and solution (P0)
Error Code
Malfunction decision
conditions
Supposed causes
Check the wiring between main PCB
and compressor
No
Check the IPM
Yes
Check the outdoor fan and the
outdoor unit ventilation
Yes
Check the compressor resistance
values
Yes
Replace the outdoor main PCB
P0
When the voltage signal that IPM send to compressor drive chip
is abnormal, the display LED will show "P0" and AC will turn off.
Wiring mistake; IPM malfunction; Outdoor fan ass'y faulty
Compressor malfunction; Outdoor PCB faulty
Yes
No
No
No
Correct the connection or replace
the wires and connectors.
Replace the IPM board or replace
the main PCB
Please refer to the solution of 【Fan
Speed Has Been Out Of Control】
malfunction
Replace the compressor.
12
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