Carrier 38MBRCQ36AA3 - Compressor Phase Protection; PC 43 Lack Phase Protection

38MBRC: Service Manual
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
34
PC 43 (Outdoor Compressor Lack Phase Protection Diagnosis and Solution)
Description: When the three-phase sampling current of the compressor is abnormal, especially when the current of one or more phases is
always small and almost 0, the LED displays the failure code
Recommended parts to prepare:
• Connection wire
• Compressor
• Outdoor PCB
Troubleshooting and repair:
Check the compressor three-
phase output for obvious open
circuit
Power o ,then restart the unit
2 minutes later.Is it still
displaying the error code?
The unit operates
normally
Check both ends of the
compressor connecting
line .Are all the connections
good?
Correct the connections
Check whether the three -
phase resistance of the
compressor is symmetrical
Replace the compressor
Yes
Yes
Yes
No
No
No
Replace the main PCB
No
Issue is resolved
Yes