Toshiba MMU-P0121H Service Manual page 78

<For 4-way Air Discharge Cassette type>
Check code
[98]
BUS communication alarm (2)
Are wiring connection
of communication cables
to X, Y normal?
YES
Is [98] displayed only
on the central controller?
YES
Are multiple central
controllers connected?
NO
Check indoor main P.C. board
(MCC-1361).
Defective Replacement
1. Miswiring of XY communication cables
2. Duplicated network addresses
3. Failure on indoor main P.C. board (MCC-1361), central controller
NO
NO
Are X, Y communication
cables connected to the server
units (No.2 to No.16 units) of
group operation?
YES
Is there duplication
of network addresses?
NO
Check indoor main P.C. board
(MCC-1361).
Defective Replacement
YES
3-75
Operation cause
Modify connection of wiring.
Modify communication cable
NO
connection to server units of
group operation.
YES
Modify duplication of network
addresses.
Modify No. of connected
central controllers to 1 unit.