Communication Error Between Indoor Header And Follower - Toshiba Super MMU-AP0091H Service Manual

Check code
[E18] / [97/99]
(d07 / AI-NET)
Are remote controller
inter-unit cables (A/B) normal?
YES
Is there any disconnection of
connector or wiring from terminal block
of indoor unit?
NO
Is a group control operation?
YES
Are powers of
all indoor units turned on?
YES
Check indoor address.
Correct indoor address.
Check code name
Communication error between
indoor header and follower
NO
YES
NO
NO
Regular communication between indoor header
and follower is unavailable.
158
Cause of operation
Correct remote controller
inter-unit wire.
Correct connection of connector.
Check circuit wire.
Check power connection status
of indoor unit.
Check indoor P.C. board.
Failure Replace