Daikin Altherma HT Service Manual

Troubleshooting by Indication on the Remote Controller ESIE09-08B
172 Troubleshooting
3.31 “J7 ” Outdoor Unit: Malfunction of Thermistor (R7T) for
Outdoor Unit Liquid Pipe
Remote Control
Display
J7
Applicable
Models
ER*Q 011~016*
Method of
Malfunction
Detection
Malfunction is detected from the temperature detected by the liquid pipe thermistor.
Malfunction
Decision
Conditions
When a short circuit or an open circuit in the heat exchange thermistor is detected.
Supposed
Causes
 Defect of thermistor (R7T) for outdoor unit liquid pipe
 Defect of outdoor unit PC board (A1P)
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.
(V3074)
NO
NO
Replace the thermistor (R7T).
YE S
YE S
Connect the thermistor and turn on again.
Connector
is connected
to X13A of outdoor unit
PC board (A1P)
Resistance
is normal when
measured after
disconnecting the thermistor
(R7T) from the outdoor
unit PC board.
(3.5kW~360kW)
Replace 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++