Mitsubishi Electric CITY MULTI PUMY-P112VKM5 Technical & Service Manual page 92

Check code
6832 6833
,
(EF)
●Diagnosis of defects
Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards.
Continued from the previous page.
Refer to the chapter ˝Electrical
Work˝.
Is the wiring connected
properly, meeting the condition?
Yes
OCH740
MA communication send error
Diagnosis
No
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).
92
Chart 2 of 2
Remedy