Daikin Altherma HT Service Manual

ESIE09-08B Troubleshooting by Indication on the Remote Controller
Troubleshooting 137
3.5 “AJ ” Indoor Unit: Malfunction of Capacity Determination
Device
Remote Control
Display
AJ
Subcode 0
Applicable
Models
All indoor unit models
Method of
Malfunction
Detection
Capacity is determined according to resistance of the capacity setting adapter 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
adapter 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 adapter.
 Defect of indoor unit PC board (A4P).
Troubleshooting
Caution
Be sure to turn off power switch before connect or disconnect
connector, or parts damage may be occured.
(V2783)
Install a capacity setting adapter.
Replace the indoor unit PC board.
(A4P)
NO
NO
YES
YES
Replace the indoor unit PC
board. (A4P)
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 adapter when
replacing the PC
board.

Daikin Altherma HT Specifications

General

Type	Air-to-water heat pump
Refrigerant	R-410A
Water Outlet Temperature	Up to 80°C
Operating Temperature Range	-20°C to 35°C
Power Supply	3-phase, 400V
Energy Efficiency Class (Heating)	A++