C4" Indoor Unit: Malfunction Of Thermistor (R2T) For Heat Exchanger - Daikin FCQ18PVJU Service Manual

SiUS28-902_a
C4
3.9 " " Indoor Unit: Malfunction of Thermistor (R2T) for
Heat 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
 Defect of thermistor (R2T) for liquid pipe
Supposed
 Defect of indoor unit P.C.B.
Causes
Troubleshooting
∗ Refer to thermistor resistance / temperature characteristics table on P.166.
Troubleshooting
Be sure to turn off the power switch before connecting or disconnecting
Caution
the connector, or parts could be damaged.
Connector
is connected to X12A
of the indoor unit
P.C.B.
YES
Resistance
is normal when
measured after
disconnecting the thermistor
(R2T) from the indoor
unit P.C.B.
(3.5kΩ ~
360kΩ)
YES
Troubleshooting by Indication on the Remote Controller
NO
KΩ
NO
Connect the thermistor and turn
on again.
Replace the thermistor (R2T).
Replace the indoor unit P.C.B.
96