Service manual

79
14
Troubleshooting
Diagnostic Procedure for Check Code
Check code Operation cause
1. Miswiring of XY communication cables
[98]
2. Duplicated network addresses
BUS communication alarm (2)
3. Indoor P.C. board error, central controller error
Is the wiring connection
of communication cables
to X,Y normal?
Is [98] displayed only
on the central controller?
Is there duplication
of network addresses?
Check connection of wiring.
Check duplication of network
addresses.
Check No. of connected
central controllers to 1 unit.
Check the central controller.
If defective, replace.
Check indoor P.C. board.
If defective, replace.
Check communication cable
connection to slave units of
group operation.
No
Yes
No
Yes
Is connection of CN602
connector on interface
P.C. board of the master
outdoor unit normal?
No
Yes
Yes
No
Is [97] displayed only
on the central controller?
Yes
No