Midea ATOM MDV-V56WDHN1(AtB)

Atom B Series VRF 50/60Hz
48
Midea
Atom B
Series
Service Manual
2.2 C0: Communication fault between main board and communicate converter board (For 28-56 models)
2.2.1 Digital display output
C0
2.2.2 Description
 Communication fault between main board and communicate converter board.
 The system stops running.
 Error code is displayed on the outdoor unit PCB.
2.2.3 Trigger / recover condition
 Trigger condition: Communicate converter board and ODU main control board cannot communicate.
 Recover condition: Communication go back to normal.
 Reset method: Resume automatically.
2.2.4 Possible causes
 Interference from high voltage wires or other sources of electromagnetic radiation.
 Communicate converter board is damage.
 Communicate wire port is loose or connecter surface is corrosive, or water drop lead to poor contact.
 Communicate wire break or poor contact for reasons (such as rat beat, or bond and connection).
2.2.5 Procedure
C0
Dismantle the connect wire between communicate converter
board and ODU main board, and then test the T and R port
voltage of the ODU main board to confirm whether it’s 5V
No
Outdoor unit main
board fault
Yes
Dismantle the T and R port between communicate converter
board and ODU main board, and then test the TR port voltage
of the communicate converter board to confirm whether it’s 5V
No
Communicate
converter board
fault
Yes
Confirm the communication port is loose or not, exclude
communication problem, confirm there’s no outer interference