Daikin Altherma HT Service Manual

ESIE09-08B Troubleshooting by Indication on the Remote Controller
Troubleshooting 167
3.26 “J3 ” Outdoor Unit: Malfunction of Discharge Pipe
Thermistor (R2T)
Remote Control
Display
J3
Applicable
Models
ER*Q 011~016*
Method of
Malfunction
Detection
Malfunction is detected from the temperature detected by discharge pipe temperature
thermistor.
Malfunction
Decision
Conditions
When a short circuit or an open circuit in the discharge pipe temperature thermistor is detected.
Supposed
Causes
 Defect of thermistor (R2T) for outdoor unit discharge pipe
 Defect of outdoor unit PC board (A1P)
Troubleshooting
 Refer to thermistor resistance / temperature characteristics table on P240.
Caution
Be sure to turn off power switch before connect or disconnect
connector, or parts damage may be occured.
(V3072)
Resistance is
normal when
measured after
disconnecting the thermistor
R2T from the outdoor unit PC
board.
(5.0kΩ~640kΩ)
Replace outdoor unit PC board
(A1P).
Connect the thermistor and turn on
again.
NO
NO
Replace the thermistor (R2T).
YES
YES
Connector
is connected to
X12A of outdoor unit PC
board (A1P).

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++