Troubleshooting Guide

Troubleshooting 52
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:
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
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
Problem is solved
Yes