Toshiba MMK-AP0072H Service Manual page 62

Check code
[E12] / [42]
(Current code / AI-NET)
Sub-code: 01: Communication between indoor and outdoor 02: Communication between outdoor units
Are U1, U2, U3, and U4
connectors connected?
YES
Disconnect connector connection
of U1, U2, U3, and U4.
Check code
[E15] / [42]
(Current code / 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
Automatic address
start error
NO
Turn on power of
outdoor unit again.
Check code name
No corresponding indoor unit
during automatic address
NO
NO
NO
YES
YES
YES
Cause of operation
1. When indoor automatic address started, other refrigerant
circuit system was setting automatic address.
2. When outdoor automatic address started, the indoor
automatic address was being set. (Sub-code: 02)
(Refer to "Address setup procedure".)
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 connection of connector.
Correct connection of connector.
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FILE NO. SVM-05052
Set up address again.
Cause of operation
Correct communication line.
Correct power cable.
Set up address again after
resetting power supply.
Eliminate noise.