Toshiba A90-0132, Service Manual

Page: 93 / 176

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