Check code

Check code name

Possible causes

 

 

 

[E09]

Duplication of R/C header

R/C header setting is duplicated.

(New code)

 

 

 

 

 

Are 2 headers set

YES

by double R/C?

 

NO

 

Correct one header/one follower. (R/C address connector)

Check R/C board.

→Replace it if necessary.

Check code

Check code name

Possible causes

 

 

 

[E18]

Communication error between header

A Improper wire connection between I/U

(New code)

and follower 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

 

 

 

Are A/B wires

NO

normal?

 

YES

 

Improper harness

YES

connection from I/U terminal

 

block?

 

NO

 

Is I/U switch SW02

NO

setting correct?

 

Bit 1, 2: OFF

 

YES

 

Group control operation?

NO

 

YES

 

Are all indoor

NO

units powered ON?

 

YES

 

 

NO

Twin or triple control?

 

YES

 

Improper signal

YES

connection between I/U

 

and O/U?

 

NO

 

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.

Check MCC-1510 board.

→Replace it if necessary.

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