Midea ATOM MDV-V56WDHN1(AtB)

Atom B Series VRF 50/60Hz
82
Midea
Atom B
Series
Service Manual
2.23.9 L1: DC bus low voltage protection
L1
Voltage of power supply is 166-265V?
No
Provide normal power supply
Yes
Check the wiring between main control board and
filter board is correct or not.
No
Connect again
Yes
Repower on and waiting for 10S,and then test the
voltage of CN4 port "RL" and "12V" port to check
whether their voltage is DC 12V
Replace outdoor main PCB
Yes
Replace outdoor filter board
2.23.10 L2: DC bus high voltage protection
L2
Voltage of power supply is 166-265V?
No
Provide normal power supply
Replace outdoor main PCB
No