Carrier 40MAHBQ06XA Service Manual page 31

SG-40MAHB-01: Service Manual
DIAGNOSIS AND SOLUTION (CONT)
High temperature protection of compressor top diagnosis and solution (P2)
Malfunction Decision Conditions
If the sampling voltage is not 5V, the LED displays a failure.
Possible Causes:
• Power supply problems
• System leak or blockage
• PCB faulty
Troubleshooting
Check the air flow system
of the indoor and outdoor units.
Power off, then restart the unit 10
compressor temperature.
Check the refrigerant system.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Yes
No
minutes later.
Yes
Check the
No
Yes
Yes
Clear up the air inlet and outlet or the heat
exchanger of the indoor and outdoor units.
Check the overload protector.
Yes
Measure the resistance
between the two ports of
the OLP. Is it zero?
Yes
Replace the outdoor control PCB.
31
No Correct the connection.
No
Replace the OLP.