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Correct cable connection
Correct central control network address.
Check operation cause.
Check indoor P.C. board (MCC-1402).
Defect Replace
Check indoor P.C. board (MCC-1402).
Defect
Replace
Check indoor P.C. board (MCC-1402).
Defect Replace
Check outside devices.
Defect Replace
Check corresponding
indoor/outdoor units.
Check central controller
(including network adapter).
Defect Replace.
NO
NO
YES
NO
NO
NO
NO
YES
YES
YES
NO
YES
YES
YES
YES
Are cable connections to
communication line X, Y normal?
Is indoor remote controller
[L20] displayed?
Is central controller [98] displayed?
Are outside devices of
connector CN80 connected?
Is check code displayed on sub unit
of main or sub remote controller?
Do outside devices normally operate?
Is group operation performed?
Are not multiple
same central control network
addresses connected?
[L20 error]/[98 error]
[L30 error]/[B6 error]
[b7 error] (Central controller)