3-74
Check code
Operation cause
[97]
BUS communication alarm (1)
1. Connection error of communication cable (PQ) between indoor
and outdoor
2. Connection error of (XY) for outdoor or indoor communication
3. Power supply system error of the central controller and indoor
4. Noise of peripheral devices
5. Power failure
6. Failure of indoor main P.C. board (MCC-1361) or central
controller
YES
NO
YES
YES
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
Modify communication cable.
Modify connection of connector.
Modify power supply wiring.
Is [97] displayed only
on the central controller?
Is there no connection error
of power supply wiring?
Are X, Y and P, Q
communication cables normal?
Is the power supply
of either central controller or
indoor/outdoor turned on?
Is the operation status
of the indoor unit reflected on
the central controller?
Is the network address
difficult from main or
sub remote controller?
Is connection of CN602
connector on interface
P.C. board of the master
outdoor unit normal?
Did power failure occur?
Is there no noise source, etc.?
Is there no noise source, etc.?
Clear the alarm after turning
on the power supply, and
start the operation.
Clear the alarm after turning
on the power supply, and
start the operation.
Indoor main P.C. board
(MCC-1361) failure
Indoor main P.C. board
(MCC-1361) failure
Eliminate noise.
<For 4-way Air Discharge Cassette type>
