Daikin Altherma HT Service Manual

Troubleshooting by Indication on the Remote Controller ESIE09-08B
170 Troubleshooting
3.29 “J5 ” Indoor Unit: Malfunction of Thermistor (R7T) for
Liquid R-134a
Remote Control
Display
J5
Subcode 11
Applicable
Models
All indoor units
Method of
Malfunction
Detection
Malfunction is detected from the temperature detected by the thermistor for liquid pipe.
Malfunction
Decision
Conditions
When a short circuit or an open circuit in the thermistor for liquid pipe are detected.
Supposed
Causes
 Defect of thermistor (R7T) for liquid R134a
 Defect of indoor unit PC board (A4P)
Troubleshooting
 Refer to thermistor resistance / temperature characteristics table on P239.
Caution
Be sure to turn off power switch before connect or disconnect
connector, or parts damage may be occured.
Resistance
is normal
when measured
after disconnecting the
thermistor (R7T) from the
indoor unit PC board.
(3.5k
~360k )
Replace indoor unit PC board
(A4P).
Connect the thermistor and turn
on again.
NO
NO
Replace the thermistor (R7T).
YES
YES
Connector of
the thermistor for
liquid pipe is connected to
X12A [3,4] of indoor
unit PC board
(A1P).
Bad wire connection
value < -43.6˚C
Faulty thermistor
value > 165˚C

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++