Mitsubishi Electric CITY MULTI PUMY-P112VKM5 Technical & Service Manual page 85

Check code
6607
(A7)
Abnormal points and detection methods
5. The cause of displayed address and attribute is on the Fresh Master
side
An abnormality detected by the indoor unit if receiving no ACK when
transmitting signal from the indoor unit to the Fresh Master.
6. The cause of displayed address and attribute is on Lossnay side
An abnormality detected by the indoor unit if receiving no ACK when the
indoor unit transmit signal to the Lossnay.
7. The controller of displayed address and attribute is not recognized
OCH740
No ACK error
Causes and checkpoints
1. While the indoor unit is operating with multi
refrigerant system Fresh Master, an abnormality
is detected when the indoor unit transmits signal
to the remote controller while the outdoor unit with
the same refrigerant system as the Fresh Master is
turned OFF, or within 2 minutes after it turned back
ON.
2. Contact failure of indoor unit or Fresh Master
transmission line
3. Disconnection of transmission connector (CN2M) on
indoor unit or Fresh Master
4. Malfunction of sending/receiving circuit on indoor
unit or Fresh Master
1. An abnormality is detected when the indoor unit
transmits signal to Lossnay while the Lossnay is
turned OFF.
2. While the indoor unit is operating with the other
refrigerant Lossnay, an abnormality is detected when
the indoor unit transmits signal to the Lossnay while
the outdoor unit with the same refrigerant system as
the Lossnay is turned OFF, or within 2 minutes after
it turned back ON.
3. Contact failure of indoor unit or Lossnay transmission
line
4. Disconnection of transmission connector (CN2M) on
indoor unit
5. Malfunction of sending/receiving circuit on indoor
unit or Lossnay
1. The previous address unit does not exist since
the address switch was changed while in electric
continuity status.
2. An abnormality detected at transmitting from the
indoor unit since the Fresh Master/Lossnay address
are changed after synchronized setting of Fresh
Master/Lossnay by the remote controller.
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