Mitsubishi Electric CITY MULTI PUMY-P112VKM6 Service Manual page 77

6832 (E3)/6833 (E5): MA communication send error
Diagnosis of failure
Continued from the previous page.
Refer to the chapter "Electrical Work".
Is the wiring connected properly
and meeting the conditions?
OCH790 _77
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