Daikin Altherma HT Service Manual

ESIE09-08B Troubleshooting by Indication on the Remote Controller
Troubleshooting 143
3.10 “CA ” Indoor Unit: Leaving Water Thermistor Error (R5T)
Remote Control
Display
CA
Subcode 0
Applicable
Models
AII indoor unit models
Method of
Malfunction
Detection
Malfunction detection is carried out by temperature detected by leaving water temperature
thermistor.
Malfunction
Decision
Conditions
When the leaving water temperature thermistor becomes disconnected or shorted while the unit
is running.
Supposed
Causes
 Defect of indoor unit thermistor for leaving water (R5T)
 Defect of indoor 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.
Replace the indoor unit PC board (A1P).
Connect the thermistor and turn
on again.
NO
NO
Replace the thermistor (R5T).
YES
YES
Connector
(X17A) is connected to
the indoor unit PC
board.
Resistance
is normal when
measured after
disconnecting the thermistor
(X17A) from the indoor unit
PC board.
(7.2k
~112k )
(V2786)
Faulty thermistor
value > 95C
Bad wire connection
value < -43.6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++