P0 Ipm Protection - Friedrich Chill Premier Inverter Series Service Manual

3.2.8 P0---IPM protection
When IPM has overheat or overcurrent fault, AC unit will display P0 protection.

P0 IPM protection

Display P0
Restart unit. It
works normal?
Wiring connection
U/V/W correct?
Can compressor
start up?
test voltage btw
U/V/W , (normally
from 20~200V.AC)
Replace compressor
End
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TROUBLESHOOTING
Yes
No
No
Yes
Yes
No
No
Yes
Replace MainPCB
Turn unit on to check
whether the malfunction
is eliminated.
No
Re-connect
Yes
P0 disappear?
No
Outdoor fan motor
no works or too
slowly?
No
Yes
AC pressure correct?
(cooling:117- 188 PSI)
No
Is the condenser
and/or evaporator
Yes
too dirty?
No
Capillary
blocked?
Yes
Replace capillary
No
P0 disappear?
Yes
Yes
Replace outdoor
fan motor
No
Works normal?
Yes
Clean it
Unit works
normal?
No
No
Yes
Yes
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