Fisher FSAI-SU-92AE2 Service Manual page 45

8.2.7 IPM malfunction or IGBT over-strong current protection diagnosis and solution (P0)
Error Code
Malfunction decision
conditions
Supposed causes
Trouble shooting:
Check the wiring between main PCB
and compressor
Check the IPM
Check the outdoor fan and the
outdoor unit ventilation
Check the compressor resistance
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
●
No
Yes
Yes
values
Yes
Correct the connection or replace
Yes
the wires and connectors.
Replace the IPM board or replace
No
the main PCB
Please refer to the solution of 【Fan
No
Speed Has Been Out Of Control】
No Replace the compressor.
45
malfunction