Daikin Altherma HT Service Manual

Troubleshooting by Indication on the Remote Controller ESIE09-08B
168 Troubleshooting
3.27 “J3 ” Indoor Unit: Malfunction of Discharge Pipe
Thermistor (R6T)
Remote Control
Display
J3
Subcode 46
Applicable
Models
All indoor units
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 (R6T) for indoor unit discharge pipe
 Defect of indoor unit PC board (A4P)
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.
Resistance
is normal when
measured after
disconnecting the
thermistor R6T from the
indoor unit PC board .
(5.0k
~640k )
Replace indoor unit PC board
(A4P).
Connect the thermistor and turn
on again.
Bad wire connection
value < -20°C
Faulty thermistor
value > 165°C
NO
NO
Replace the thermistor (R6T).
YES
YES
Connector
is connected to
X12A [1,2] of indoor unit
PC board
(A4P).

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++