Carrier QHC Series Service Manual page 50

10.2.9 High temperature protection of IPM module diagnosis and solution (P2)
Error Code
Malfunction decision
conditions
Supposed causes
Trouble shooting:
Check if the Fastening screws
on the PCB and IPM radiator
are fixed tightly.
No
Tighten the screws and apply
Tighten the screws and apply
silicon grease.
silicon grease.
P2
If the temperature of IPM module is higher than limited value, the
LED will display the failure.
IPM radiator problem
●
PCB faulty
●
Replace the outdoor control PCB.
Replace the outdoor control PCB.
Yes
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