Ground - Mitsubishi Electric City Multi PUMY-SP112VKM Technical & Service Manual

Check code
6600
(A0)
Abnormal points and detection methods
Abnormal if 2 or more units with the same address are existing.
●Diagnosis of defectives
Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards.
Search for a unit with the same address as
the source of abnormality.
Is there any unit with the same
address?
Turn the power back ON.
Does it operate normally?
OCH668B
Duplex address error
Diagnosis
No
Yes
Causes and checkpoints
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
Correct the address, and turn the power
Yes
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
No
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).
82
Remedy