innovair PIN413C2V31 Service Manual page 45

10.4.7 IPM malfunction or IGBT over-strong current protection diagnosis and solution(P0)
Error Code
Malfunction decision
conditions
Supposed causes
Trouble shooting:
Check if the wiring between main
PCB and compressor connected by
error and if the wires and connectors
are broken?
No
IPM continuity check. Check if the
IPM terminal resistance values are
uniform. Refer to page 64.
Yes
Check if the outdoor fan runs
properly or the outdoor unit
ventilation is good.
Yes
Check if the compressor resistance
values are uniform .Refer to page 63.
Yes
Replace the outdoor main PCB if the
main PCB and IPM are separate.
connector, the resistance should be around 88.5Ω at 20℃(68℉)
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
No
Correct the connection or replace
Yes
Replace the IPM board or replace the
No main PCB if the IPM board and main
PCB are integrated together.
please refer to the below remark, check whether the
resistance of the fan motor is normal. If not, replace
No Replace the compressor.
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the wires and connectors.
the fan motor.