Daikin ERQ - 3.15 “E1” Outdoor Unit: PC Board Defect

ESIE09-05 Troubleshooting by Indication on the Remote Controller
Troubleshooting 171
3.6 “AJ” AHU: Malfunction of Capacity Determination Device
Remote
Controller
Display
AJ
Applicable
Models
All AHU 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 AHU 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 AHU 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 AHU PC board.
NO
NO
YES
YES
Replace the AHU PC board.
The AHU
PC board was replaced
with a replacement
PC board.
The AHU
is a model that
requires installation of a
capacity setting adaptor
when replacing the
PC board.
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