Daikin FTX25JVEA9, Service Manual

Page: 270 / 410

Si18-201 Troubleshooting - SkyAir Indoor Unit
Service Diagnosis 257
2.6.5 Failure of Capacity Setting
Remote
Controller
Display
AJ
Applicable
Models FHYC
Method of
Malfunction
Detection Capacity is determined according to resistance of the capacity setting adaptor and the memory
inside the IC memory on the indoor unit PC board, and whether the value is normal or abnormal
is determined.
Malfunction
Decision
Conditions Operation and:
(1)When the capacity code is not contained in the PC board’s memory, and the capacity setting
adaptor is not connected.
(2)When a capacity that doesn’t exist for that unit is set.
Supposed
Causes
"
Failure of capacity setting adaptor connection
"
Failure of indoor unit PC board
Troubleshooting
Note: Capacity is factory set in the data IC on the PC board. A capacity setting adaptor that matches
the capacity of the unit is required in the following case.
If the indoor PC board installed at the factory is for some reason changed at the installation site,
the capacity will not be contained in the replacement PC board.
If you connect a capacity setting adaptor to a PC board in which the capacity is memorized, the
capacity setting for the PC board will become the capacity setting of the adaptor. (Priority of
capacity setting adaptor)
Turn the power supply off
once and back on.
Is the
capacity setting
adaptor plugged into X23A
of the indoor unit PC
board?
NO
Is AJ displayed on
the remote controller?
NO
YES
YES
Plug a capacitor setting
adaptor that matches the
capacity of the unit into X23A.
(See note)
Indoor unit PC board
replacement
Could be outside cause (noise,
etc.) other than malfunction.
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
(MF015)