Carrier 38MGRBQ18B-3 - Outdoor Compressor Lack Phase Protection (PC43); Outdoor Unit IR Chip Drive Failure (PC45)

38MGRBQ: Service Manual
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
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Outdoor compressor lack phase protection (PC43)
Outdoor unit IR chip drive failure (PC45)
Check the compressor
three-
phase output for obvious
open circuit
Power off
,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 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
Problem solved
Yes
Power off
,
then restart the unit
2 minutes later.
Replace the i
nverter module
PCB.
Yes