Carrier 38QUA009DS, Service Manual, Page: 107 / 116

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16.3.9 High temperature protection of compressor top diagnosis and solution (P2)
Error Code
P2
Malfunction decision
conditions
If the sampling voltage is not 5V, the LED will display the failure.
Supposed causes
●
Power supply problems.
●
System leakage or block
●
PCB faulty
Trouble shooting:
Check the air flow system
of indoor and outdoor units.
Does a problem exist?
Clear up the air inlet and outlet or the heat
exchanger of the indoor and outdoor units.
Yes
No
Yes
Yes
Power off and then restart the unit
10 minutes afterwards
Check compressor
temperature. Is it within
acceptable parameters?
No
Check the refrigerant
system. Is it functioning
properly?
Yes
Check the overload
protector. Is it properly
wired?
Ensure a proper
connection
No
Measure the resistance
between the two ports of
the OLP. Is it zero?
Yes
Replace the OLP
No
Replace the outdoor control PCB
Yes