No Corresponding Indoor Unit During Automatic Address - Toshiba Super MMU-AP0091H Service Manual

Check code
[E15] / [42]
(d07 / AI-NET)
Is communication line between
indoor and outdoor normal?
YES
Is connection of CN40 connector
on indoor P.C. board correct?
YES
Is connection of CN01
connector on I/F P.C. board of
header outdoor unit correct?
YES
Is there any connection
error of power cable?
NO
Did a power failure occur?
NO
Is there no noise source?
NO
Set up address again
after resetting power supply.
Check code name
No corresponding indoor unit
during automatic address
NO
NO
NO
YES
YES
YES
156
Cause of operation
1. Communication line connection error
between indoor and outdoor.
2. Indoor power system error
3. Noise from surrounding devices
4. Power failure
5. Indoor P.C. board error
Correct communication line.
Correct connection of connector.
Correct connection of connector.
Correct power cable.
Set up address again after
resetting power supply.
Eliminate noise.