Midea MP12HMB63 - Communication Malfunction Diagnosis

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10.2.2 Communication malfunction between main control board and display board (E4).
Error Code:
E4
Malfunctioning conditions:
Main control board does not receive feedback from display
board during 120 seconds.
Possible causes:
●
Wiring error
● Faulty display board
●
Faulty main control board
Troubleshooting:
Communication malfunction
between main control board and
display board
Replace the main
control board.
Check signal wire between the
display board and main board.
Is it properly connected?
No
Yes
Reconnect and retry. Is
error still showing?
No
Yes
Replace display board. Is
error still showing?
No
Yes
Trouble is fixed.