Midea ATOM MDV-V56WDHN1(AtB)

Atom B Series VRF 50/60Hz
61
Part
6
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Diagnosis and Troubleshooting
2.13 F1: DC bus voltage protection (for all models)
2.13.1 Digital display output
F1
2.13.2 Description
 F1 indicates DC bus voltage protection.
 The system stops running.
 Error code is displayed on the outdoor unit PCB.
2.13.3 Trigger / recover condition
 Trigger condition: If IC55 main chip couldn’t receive the DC bus voltage detection signal or the voltage less than 200VDC in the
first 5 seconds period when power on, it would report F1 and the big relay is forbid to close.
 Recover condition: IC55 main chip can receive the DC bus voltage detection signal and the voltage over 200V DC.
 Reset method: Resume automatically.
2.13.4 Possible causes
 DC fan motor damaged.
 The wire connect CN52 with CN53 is loose (36/42 model can ignore this reason for there’s not this wire
connection).
 Main control board damaged.
 Filter board damaged (36/42 model can ignore this reason for they don’t have a filter board).
2.13.5 Procedure
F1
Check LED301 Is flashing or not
No
Replace outdoor main PCB
Yes
Check the wiring between main control
board and filter board is correct or not.
No
Connect again
Yes
Voltage of power supply is 166-265V?
No
Provide normal power supply