Daikin REYQ72 - C9 Indoor Unit: Malfunction of Thermistor (R1 T) for Suction Air

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