Check code
Check code name
Possible causes
Duplication of R/C header
R/C header setting is duplicated.
[E09]
(New code)
Check code
Check code name
Possible causes
Communication error between header
and follower I/U
A
Improper wire connection between I/U
B
Improper wire connection between I/U and O/U
C
Failure of I/U board
D
Invalid I/U board switch setting
[E18]
(New code)
Are 2 headers set
by double R/C?
Correct one header/one follower.
(R/C address connector)
Check R/C board.
→
Replace it if necessary.
NO
YES
Correct R/C wire connection.
Correct connector connection.
Check circuit wiring.
Correct switch setting on
MCC-1510 board.
Check I/U power connection
(power off and on).
Correct signal wire connection
between I/U and O/U.
Are A/B wires
normal?
Improper harness
connection from I/U terminal
block?
Is I/U switch SW02
setting correct?
Bit 1, 2: OFF
Group control operation?
Are all indoor
units powered ON?
Twin or triple control?
Improper signal
connection between I/U
and O/U?
Check MCC-1510 board.
→
Replace it if necessary.
NO
YES
YES
YES
NO
NO
YES
NO
NO
NO
NO
YES
YES
YES
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