Toshiba RAV-SM454MUT-TR, RAV-SM454MUT-E L20 error, L30 error, P30 error Central controller

[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-1402).

Defect → Replace

NO

YES

Correct wiring connection.

Correct central control system address.

[L30 error]

Are outside devices of	NO
connector CN80 connected?
YES
	NO
Do outside devices normally work?
YES
Check cause of operation.

Check indoor P.C. board (MCC-1402).

Defect → Replace

Check outside devices.

Defect → Replace

[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

NO

Check indoor P.C. board (MCC-1402).

Defect → Replace

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