Daikin FCQ18PVJU - C9 Indoor Unit: Malfunction of Thermistor (R1 T) for Suction Air

SiUS28-902_a Troubleshooting by Indication on the Remote Controller
Troubleshooting 98
3.11 “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 P.C.B.
Troubleshooting
∗ Refer to thermistor resistance / temperature characteristics table on P.166.
Caution
Be sure to turn off the power switch before connecting or disconnecting
the connector, or parts could be damaged.
Replace the indoor unit P.C.B.
Connect the thermistor and turn
on again.
NO
NO
Replace the thermistor (R1T).
YES
YES
Connector
is connected to X13A
of the indoor unit
Resistance
is normal when
measured after
disconnecting the thermistor
(R1T) from the indoor
unit P.C.B.
(7.2kΩ~
112kΩ)