– 54 –
Troubleshooting (Continued)
Is O/U free from
power fluctuation?
Check CDB board.
Check power voltage.
Improve power lines.
Check external noise.
YES
NO
Is indoor unit
capacity set?
Set I/U capacity data. (DN=11)
Check MCC-1510 board.
→
Replace it if necessary.
YES
NO
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
O/U EEPROM error
[F31]
(New code)
Check code
[E08][L03][L07][L08]
(New code/old code)
Check code
Check code name
Possible causes
Indoor unit capacity not set
Indoor unit capacity not set
[L09]
(New code)
A. Failure of O/U power supply (voltage, noise, etc.)
B. Failure of O/U CDB board.
