Turbo Air TAS-18EHN Service Manual page 51

9.2.5 IPM malfunction or IGBT over-strong current protection diagnosis and solution(P0)
Check if the wiring between main
PCB and compressor connected by
error and if the wires and connectors
are broken?
No
Check if the IPM installed correctly.
Yes
IPM continuity check. Check if the
IPM terminal resistance values are
uniform.
Yes
Check if the outdoor fan runs
properly or the outdoor unit
ventilation is good.
Yes
Check if the compressor resistance
values are uniform .
Yes
Replace the outdoor main PCB if the
main PCB and IPM are separate.
Correct the connection or
Yes replace the wires and
Correct the installation,
No tighten the screws and
apply silicon grease.
Replace the IPM board or replace
No the main PCB if the IPM board and
main PCB are integrated together.
Refer to the solution of fan speed
has been out of control
No
malfunction . Find out the cause
and have it solved.
No Replace the compressor.
51
connectors.