Troubleshooting (Continued)

 

Check code

 

Check code name

Possible causes

 

 

 

 

 

 

 

 

[F31]

 

O/U EEPROM error

AFailure of O/U power supply (voltage, noise, etc.)

 

(New code)

 

 

BFailure of O/U CDB board.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Is O/U free from

NO

 

Check power voltage.

 

 

 

Improve power lines.

 

 

power fluctuation?

 

 

 

 

 

 

Check external noise.

 

 

 

 

 

 

 

 

YES

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Check CDB board.

 

 

 

 

 

 

 

 

 

 

 

Check code

[E08][L03][L07][L08]

(New code/old code)

E08: I/U number duplicated

L03: Multiple header I/U under group control

L07: One or more group address “individual” under group control

L08: I/U group address not set (99)

When any of these codes is detected at power on, the unit enters auto address setting mode automatically. (No code is indicated.)

However, if any of these codes is detected in the auto address setting mode, a check code is displayed in some cases.

Check code

 

Check code name

Possible causes

 

 

 

 

[L09]

 

Indoor unit capacity not set

Indoor unit capacity not set

(New code)

 

 

 

 

 

 

 

 

 

Is indoor unit

NO

 

 

 

Set I/U capacity data. (DN=11)

capacity set?

 

 

 

 

 

YES

 

 

 

 

 

 

 

 

Check MCC-1510 board.

 

 

 

 

 

 

 

 

→ Replace it if necessary.

 

 

 

 

 

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