Aiwa -09CHSRINV/TP11 Service Manual page 46

3.2.8 P0---IPM protection
When overheat or overcurrent for IPM, AC unit will display P0 protection.
Display P0
Restart unit. It
works normal?
No
Wiring connection
U/V/W correct?
Yes
Can compressor
start up?
No
test voltage btw
U/V/W , (normally
from DC 20~200V.)
Yes
whether the malfunction
Replace compressor
End
Air Conditioner Service Manual
Yes
No
Yes
No
Yes
Replace ODU PCB
Yes
Turn unit on to check
is eliminated.
No
Re-connect
Yes
P0 disappear?
No
ODU fan motor no
works or too slowly?
No
AC pressure correct?
(cooling:0.8-1.3Mpa,/
heating 2.0-3.6Mpa)
No
Is the condenser
and/or evaporator
too dirty?
No
Capillary
blocked?
Yes
Replace capillary
No
P0 disappear?
Yes
Yes
Replace ODU
fan motor
No
Works normal?
Yes
Clean it
Unit works
normal?
No
No
Yes
Yes
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