Daikin REYQ72, Serveice Manual

Page: 148 / 273

SiUS39-602 Troubleshooting by Indication on the Remote Controller
Troubleshooting 137
2.8
“
AJ
”
Indoor Unit: Malfunction of Capacity Determination
Device
Remote
controller display
AJ
Applicable
Models All indoor unit models
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
„
You have forgotten to install the capacity setting adaptor.
„
Defect of indoor unit PC board
Troubleshooting
(V2783)
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Install a capacity setting adaptor.
Replace the indoor unit PC board.
NO
NO
YES
YES
Replace the indoor unit PC board.
The indoor
unit PC board was replaced
with a replacement
PC board.
The indoor
unit is a model that
requires installation of a
capacity setting adaptor
when replacing the
PC board.