Midea Mini C Series Service Manual page 61

Mini C Series VRF 50/60Hz
2.10 EF: PFC fault (Only for 100~160 model)
2.10.1 Digital display output
EF
2.10.2 Description
 PFC fault protection.
 The system stops running.
 Error code displayed on the outdoor unit PCB.
2.10.3 Trigger / recover condition
 Trigger condition: if
DC generatrix
 Recover condition:
DC generatrix
 Reset method: Manually restart.
2.10.4 Possible causes
 DC fan motor damaged.
 Main PCB damaged.
2.10.5 Procedure
Detect the 220V power supply input port to
see whether the voltage is stable
Power off for 3 minutes and then repower on
Check whether fault is cleared
Outdoor unit main control board damaged
60
voltage is over 450V for continue 3s or over 500V in the first 5s in PFC star period.
voltage is normal in the first 5s in PFC star period.
EF
No
No
Waiting for 220V power supply
No
stable
Yes
Power supply is abnormal