Mitsubishi Electric CITY MULTI PUMY-P112VKM6 Service Manual page 65

6600 (A0): Duplex address error
Abnormal points and detection methods
2 or more units with the same address exist.
Diagnosis of failure
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?
OCH790 _65
Yes
No
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 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).