Service Manual

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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 sub remote controller in main
and sub remote controllers?
Are wiring connections
to communication lines
U3 and U4 normal?
Check central controller
(including network adapter) and
indoor P.C. board (MCC-1570).
Defect → Replace
Correct wiring connection.
Correct central control system address.
Check indoor P.C. board (MCC-1570).
Defect → Replace
Check outside devices.
Defect → Replace
Check indoor P.C. board (MCC-1570).
Defect → Replace
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
[L30 error]
[P30 error] (Central controller)