Daikin Altherma HT Service Manual

Troubleshooting by Indication on the Remote Controller ESIE09-08B
166 Troubleshooting
3.25 “H9 ” Outdoor Unit: Malfunction of Thermistor (R1T) for
Outdoor Air
Remote Control
Display
H9
Applicable
Models
ER*Q 011~016*
Method of
Malfunction
Detection
Malfunction is detected from the temperature detected by the outdoor air thermistor.
Malfunction
Decision
Conditions
When the outside air temperature thermistor has short circuit or open circuit.
Supposed
Causes
 Defect of thermistor (R1T) for outdoor air
 Defect of outdoor unit PC board (A1P)
Troubleshooting
 Refer to “Thermistor Resistance / Temperature Characteristics” table on page 239.
Caution
Be sure to turn off power switch before connect or disconnect
connector, or parts damage may be occured.
(V3070)
Resistance
is normal when
measured after
disconnecting the thermistor
(R1T) from the outdoor
unit PC board.
(3.5kΩ to
360kΩ)
Connector
is connected to X11A
of outdoor PC board
(A1P).
Replace outdoor unit PC board
(A1P).
Connect the connector and turn
on again.
NO
NO
Replace the thermistor (R1T).
YES
YES

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++