Pc43 Outdoor Compressor Lack Phase Protection - Carrier 38MBRC Series Service Manual

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