Ca" Indoor Unit: Malfunction Of Thermistor (R4T) For Discharge Air - Daikin RTSQ20PY1 Service Manual

Troubleshooting by Indication on the Remote Controller
CA
4.12 " " Indoor Unit: Malfunction of Thermistor (R4T) for
Discharge Air
CA
Remote
Controller
Display
Applicable All 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
∗
241
Defect of indoor unit thermistor (R4T) for air inlet
Defect of indoor unit PCB
Be sure to turn off power switch before connect or disconnect connector,
Caution
or parts damage may be occurred.
Remove the thermistor from
the indoor unit PCB, and then
insert it again.
Is the
thermistor
normal?
NO
Remove the thermistor from
the indoor unit PCB, and then
make resistance measurement
of the thermistor using a
multiple meter.
∗ 5 kΩ to 90 kΩ
YES
Refer to "Thermistor Resistance / Temperature Characteristics" table on P.408.
YES
NO
SiBE31-801_C
Normal (The malfunction is
caused by faulty contact.)
Replace the thermistor (R4T).
Replace the indoor unit PCB.
Troubleshooting