Mitsubishi Electric MXZ-SM72TAM-U1 Service Manual page 78

6831 (E0)/6834 (E4): MA communication receive error
Diagnosis of failure
Continued from the previous page.
Refer to the chapter "Electrical
Work".
Is the wiring connected
properly and meeting the
conditions?
OCH800A_78
No
Yes
Connect the wiring properly as specified in the
chapter "Electrical Work" in the indoor unit
Installation Manual.
No abnormality
It might be caused by an external noise, so
check the transmission line to remove the
factor(s).
Chart 2 of 2