Toshiba RAV-SM406BT-E Service Manual page 49

[L20 error]
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-1631).
Defect → Replace
[L30 error]
Are outside devices of
connector CN80 connected?
YES
Do outside devices normally work?
YES
Check cause of operation.
[P30 error] (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
NO
NO
NO
– 49 –
Correct wiring connection.
Correct central control system address.
Check indoor P.C. board (MCC-1631).
Defect → Replace
Check outside devices.
Defect → Replace
Check indoor P.C. board (MCC-1631).
Defect → Replace