[97] Central Management Communication Short Circuit - Toshiba HFCR407C Service Manual

Diagnostic procedure for check code
Check code
[97]
Central management communication
short circuit
Are X,Y and PQ communication
cables normal?
Yes
Is connection of CN101 on the
indoor PC board normal?
(When indoor PQ communication
cable is connected.)
Yes
Is connection of CN602 on
interface PC board of the master
outdoor unit normal?
Yes
Is there a connection error of
power source wiring?
No
Is the power source of either
central controller or indoor/
outdoor turned on?
Yes
Did power failure occur?
No
Is [97] displayed only on
the central controller?
Yes
Is the network address
different from main or sub
remote controller?
Yes
Clear the alarm after turning on
the power source, and start the
operation.
Troubleshooting
Operation cause
1. Connection error of communication cable (PQ)
between indoor and outdoor units
2. Connection error of (XY) for outdoor units
3. Power source system error of the central controller
and indoor unit
4. Noise of peripheral devices
5. Power failure
6. Indoor PC board error, central controller error
No
No
No
Yes
No
Yes
Is the operation status of
No
the indoor unit reflected on
the central controller?
Yes
No
Is there noise
interference, etc.?
No
Central controller error
93
Check communication cable.
Check connector connection.
Check connector connection.
Check power source wiring.
Clear the alarm after turning on the
power source, and start the operation.
No
Indoor PC board error
No
Is there noise
interference, etc.?
Yes
Yes
Eliminate noise interference.
14