Pc 43 (Outdoor Compressor Lack Phase Protection Diagnosis And Solution) - MrCool DIY-MULTI2-18HP230C Service Manual

8.17 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:
Power off,then restart the unit
2 minutes later.Is it still
displaying the error code
Yes
Check both ends of
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
Trobule is solved

No
No
Replace the compressor
No
No
Troubleshooting 52
The unit operates
normally
Correct the connections
Replace the main PCB
