Toshiba MM-A0280HT Service Manual page 69

Communication alarm between
Is there a miswiring or
disconnection of PQ
communication cable?
Is the connection
of CN101 on the indoor
P .C. board normal?
Is the connection of
CN601 on the outdoor
interface P .C. board normal?
Is the power supply of the
outdoor unit turned on?
Did a power failure occur?
Is there noise interference, etc.?
Check indoor P .C. board.
14
If defective, replace.
NOTE:
1. When first turning on the power supply of the indoor unit, and when pushing the
START/STOP button before turning on the power supply of the outdoor unit, "95" may be
displayed. This is not abnormal therefore clear the check code.
2. If "95" is displayed only on the 7 segment of the outdoor unit, it is considered that power
supply of the master outdoor unit is not switched on, or a P .C. board error of the master
outdoor unit has occurred.
Troubleshooting
Diagnostic Procedure for Check Code
Check code
[95]
indoor and outdoor
Yes
No
No
Yes
No
Yes
No
Yes
Yes
No
Yes
No
Operation cause
1. Connection error of communication cable (PQ)
between indoor and outdoor units
2. Connection error of connector for indoor
communication, P .C. board error
3. Connection error of connector for outdoor
communication, interface P .C. board error
Turn on source power of outdoor unit.
Check noise interference etc., and remove it.
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Check communication cable.
Check wiring of wire connector.
Clear the check code.