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[L20 error]
Is group operation carried out?
Do outside devices normally work?
Check cause of operation.
Check corresponding
indoor unit/outdoor unit.
Are outside devices of
connector CN80 connected?
Is not the multiple same central
control system addresses connected?
Is there check code
on remote controller in the
follower remote controller?
Are wiring connections
to communication lines
U3 and U4 normal?
Check central controller
(including 1:1 model connection interface)
and indoor P.C. board (MCC-1631).
Defect → Replace
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
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
[L30 error]
[P30 error] (Central controller)