Trouble Shooting - Carrier 42QHC009DS Service Manual

9.2.8 High temperature protection of compressor top diagnosis and solution(P2)
Error Code
Malfunction decision
conditions
Supposed causes

Trouble shooting:

Check the air flow system
of indoor and outdoor units
No
Power off, then restart the unit 10
minutes later
Yes
Check if the temperature
of compressor
Yes
Check refrigerant system
Yes
P2
If the sampling voltage is not 5V, the LED will display the failure.
Power supply problems.
●
System leakage or block
●
PCB faulty
●
Clear up the air inlet and outlet or the heat
Yes
exchanger of indoor and outdoor units.
Check the overload
No
protector
Yes
Measure the resistance
between the two ports of
the OLP. Is it zero?
Yes
Replace the outdoor control PCB.
No Correct the connection.
No
Replace the OLP.
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