C4" Indoor Unit: Malfunction Of Thermistor (R2T) For Heat Exchanger - Daikin RXYQ72 Serivce Manual

SiUS39-601
"C4" Indoor Unit:
2.9
Exchanger
C4
Remote
Controller
Display
Applicable All indoor unit models
Models
Method of Malfunction detection is carried out by temperature detected by heat exchanger thermistor.
Malfunction
Detection
Malfunction When the heat exchanger thermistor becomes disconnected or shorted while the unit is running.
Decision
Conditions
Supposed
Causes
Troubleshooting
∗
Troubleshooting
Malfunction of Thermistor (R2T) for Heat
Defect of thermistor (R2T) for liquid pipe
Defect of indoor unit PC board
Be sure to turn off power switch before connect or disconnect connector,
Caution or parts damage may be occurred.
Connector
is connected to X12A
of the indoor unit PC
board.
YES
Resistance
is normal when
measured after
disconnecting the thermistor
(R2T) from the indoor
unit PC board
(3.5kΩ~
360kΩ)
1
*
YES
1: Refer to thermistor resistance / temperature characteristics table on P239.
Troubleshooting by Indication on the Remote Controller
NO
NO
Connect the thermistor and turn
on again.
Replace the thermistor (R2T).
Replace the indoor unit PC board.
(V2784)
131