MXZ-SM42NAMHZ Service Manual

91
OCH789
Check code
Abnormal points and detection methods Causes and checkpoints
If 2 or more units with the same address are existing. There are 2 units or more with the same address
in their controller among outdoor unit, indoor unit,
Fresh Master, Lossnay or remote controller
Noise interference on indoor/outdoor connectors
●Diagnosis of defects
Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards.
Diagnosis Remedy
6600
(A0)
Duplex address error
No
Yes
Yes
No
Is there any unit with the same
address?
Does it operate normally?
Correct the address, and turn the power
OFF of indoor/outdoor unit, Fresh Master
or Lossnay simultaneously for 2 minutes or
more, then turn the power back ON.
Malfunction of sending/receiving circuit on
indoor/outdoor unit is suspected.
There is no abnormality on the AC unit
It might be caused by an external noise, so
check the transmission line to remove the
factor(s).
Search for a unit with the same address as
the source of abnormality.
Turn the power back ON.