Midea ATOM MDV-V56WDHN1(AtB)

Atom B Series VRF 50/60Hz
58
Midea
Atom B
Series
Service Manual
2.10 EF: PFC fault (For all models)
2.10.1 Digital display output
EF
2.10.2 Description
 PFC fault protection.
 The system stops running.
 Error code is displayed on the outdoor unit PCB.
2.10.3 Trigger / recover condition
 Trigger condition: DC bus voltage is over 450V for continue 3 S or over 500V in the first 5 s in PFC star period.
 Recover condition: DC bus voltage is normal in the first 5 s in PFC star period.
 Reset method: Manually restart.
2.10.4 Possible causes
 DC fan motor damaged.
 Main PCB damaged.
2.10.5 Procedure
EF
Detect the 220V power supply input port to
see whether the voltage is stable
No
Waiting for 220V power supply
stable
No
Power off for 3 minutes and then repower on
Check whether fault is cleared
Yes
Power supply is abnormal
No
Outdoor unit main control board damaged