C4" Indoor Unit: Malfunction Of Thermistor (R2T) For Heat Exchanger - Daikin RTSQ20PY1 Service Manual

SiBE31-801_C
C4
4.9 " " 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
Supposed
Causes
Troubleshooting
∗
Troubleshooting
Defect of thermistor (R2T) for liquid pipe
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.
Troubleshooting by Indication on the Remote Controller
YES
NO
Normal (The malfunction is caused
by faulty contact.)
Replace the thermistor (R2T).
Replace the indoor unit PCB.
238