Malfunction Of Capacity Setting - Daikin E-Series Service Manual

Troubleshooting for SkyAir Indoor Unit
5.7

Malfunction of Capacity Setting

AJ
Remote Control
Display
Applicable
FFQ-B, FHQ-BU
Models
Method of Capacity is determined according to resistance of the capacity setting adapter and the memory
Malfunction inside the IC memory on the indoor unit PCB, and whether the value is normal or abnormal is
determined.
Detection
Malfunction
Operation and:
Decision (1)When the capacity code is not contained in the PCB's memory, and the capacity setting
adapter is not connected.
Conditions
(2)When a capacity that doesn't exist for that unit is set.
" Failure of capacity setting adapter connection
Supposed
" Failure of indoor unit PCB
Causes
Troubleshooting
Note: Capacity is factory set in the data IC on the PCB. A capacity setting adapter that matches the
capacity of the unit is required in the following case.
If the indoor PCB installed at the factory is for some reason changed at the installation site, the
capacity will not be contained in the replacement PCB.
If you connect a capacity setting adapter to a PCB in which the capacity is memorized, the
capacity setting for the PCB will become the capacity setting of the adapter. (Priority of capacity
setting adapter)
290
Be sure to turn off power switch before connect or disconnect connector,
Caution
or parts damage may be occurred.
Is the
capacity setting
adapter plugged into X23A
of the indoor unit
PCB?
YES
Turn the power supply off once
and back on.
Is AJ displayed on
the remote control?
NO
NO
YES
SiENBE18-621
Plug a capacitor setting
adapter that matches the
capacity of the unit into
X23A. (See note)
Bad contact of capacity
setting adaptor or
disconnected adaptor.
Indoor unit PCB
replacement
Could be outside cause
(noise, etc.) other than
malfunction.
(Q0415)
Troubleshooting