Carrier DHMVHA Service Manual page 33

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DIAGNOSIS AND SOLUTION (CONT.)
NOTE: Measure the DC voltage between ports P and N (the normal value should be around 310V).
High Temperature Protection of Compressor Top (PC02)
Error Code
Malfunction decision conditions
Supposed causes
Troubleshooting
For sizes 18-24:
Check if the fastening screws
on the PCB and IPM heat sink
Tighten the screws and apply
For all other models (sizes):
Check if the air flow systems
of the indoor and outdoor units
are obstructed.
Turn off the power supply.
Wait 10 minutes then turn back on.
Yes
Check if the compressor top
temperature is higher than 90°C.
Yes
Check if the refrigerant system
is normal.
Yes
Replace the outdoor control PCB.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
PC02
If the sampling voltage is not 5V, the LED displays the failure.
Power supply functions
System leakage or block
PCB faulty
are secure and tight.
No
silicon grease.
Clear up the air inlet and outlet or the heat
exchanger of the indoor and outdoor units.
Check if all the connections, especially
No
the connection of the OLP (Over Load
Repair the refrigerant system.
Yes
Replace the outdoor control PCB.
Protector) sensor is good.
Measure the resistance
between the two points of OLP.
It is zero?
33
No
Check the connections.
Replace the OLP.
Replace the outdoor control PCB.