Toshiba RAV-HM301MUT-E Service Manual page 60

[L20 trouble]
Are wiring connections
to communication lines
Uh (U3, U4) normal?
YES
Is the multiple same central
control system addresses connected?
YES
Correct central control system address.
[L30 trouble]
Do outside devices normally work?
(Outside devices connected with Application
control kit input terminal TB2 : IN1)
YES
Check cause of operation.
[P30 trouble] (Central controller)
Is group operation carried out?
YES
Is there check code
on follower unit in master
and sub remote controllers?
YES
Check corresponding
indoor unit/outdoor unit.
NO
NO
NO
NO
NO
– 60 –
Correct wiring connection.
Replace central controller
(including "1:1 model" connection interface)
and indoor P.C. board (MCC-1643).
Replace outside devices.
Replace indoor P.C. board (MCC-1643).