Toshiba RAV-RM2801DTP Series Service Manual page 55

[L20]
Are wiring connections
to communication lines
U3 and U4 normal?
YES
Is not the multiple same central
control system addresses connected?
NO
Check central controller
(including 1:1 model connection interface)
and indoor P.C. board (MCC-1643).
Defect → Replace
[L30]
Do outside devices normally work?
Outside devices connected with Application
control kit input terminal
YES
Check cause of operation.
[P30] (Central controller)
Is group operation carried out?
YES
Is there check code
on remote controller in the
follower remote controller?
YES
Check corresponding
indoor unit/outdoor unit.
NO
YES
NO
TB2 : IN1
NO
NO
Correct central control system address.
Check indoor P.C. board (MCC-1643).
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Correct wiring connection.
Check outside devices.
Defect → Replace
Defect → Replace