Check the fan 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 the wiring of fan
motor.Are all the connections
good?
Correct the connections
Check whether the three-
phase resistance of the fan is
symmetrical
Replace the fan motor
Yes
Yes
Yes
No
No
No
Replace the main PCB
No
Trobule is solved
Yes
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