High Temperature Protection Of Compressor Top Diagnosis And Solution - Carrier 38MAQB12-1 Service Manual

DIAGNOSIS AND SOLUTION (CONT)
High temperature protection of compressor top diagnosis and solution (P2)
Error Code
Malfunction decision conditions
Supposed causes
Troubleshooting
Check the air flow system
of indoor and outdoor units
No
Power off, then restart the unit 10
minutes later
Yes
Check the temperature
of the compressor
Yes
Check refrigerant system
P2
If the sampling voltage is not 5V, the LED displays 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
Measure the resistance
between the two ports of
the OLP. Is it zero?
Yes Replace the outdoor control PCB.
No Correct the connection.
protector
Yes
No
Replace the OLP.
Yes
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