C9" Indoor Unit: Malfunction Of Thermistor (R1T) For Suction Air - Daikin REYQ72 Serveice Manual

Troubleshooting by Indication on the Remote Controller
2.11 " C9 " Indoor Unit:
Suction Air
C9
Remote
Controller
Display
Applicable AII indoor unit models
Models
Method of Malfunction detection is carried out by temperature detected by suction air temperature
thermistor.
Malfunction
Detection
Malfunction When the suction air temperature thermistor becomes disconnected or shorted while the unit is
running.
Decision
Conditions
Supposed
Causes
Troubleshooting
∗
1: Refer to thermistor resistance / temperature characteristics table on P.239.
140
Malfunction of Thermistor (R1T) for
Defect of indoor unit thermistor (R1T) for air inlet
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 X13A of
the indoor unit PC
board.
YES
Resistance
is normal when
measured after
disconnecting the thermistor
(R1T) from the indoor
unit PC board.
(7.2kΩ~
112kΩ)
∗1
YES
NO
NO
SiUS39-602
Connect the thermistor and turn
on again.
Replace the thermistor (R1T).
Replace the indoor unit PC board.
(V2786)
Troubleshooting