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Components
Service manual
145
FTXA20~50A(W)(S)(T) + FTXA20~50B(B)(S)(T) + RXA42+50A +
RXA20~35A(9) + RXA42+50B
Split Stylish R32
ESIE18-03D – 2021.05
Is the thermistor correctly installed
(thermal contact between the
thermistor and the piping)?
Action
Yes
Perform an electrical check of the
specific thermistor, see
No
Correctly install the thermistor, see
To perform an electrical check of the specific thermistor
1
First perform a mechanical check of the thermistor, see
2
Locate the thermistor.
INFORMATION
Remove the thermistor from its holder if not reachable with a contact thermometer.
3
Measure the temperature using a contact thermometer.
Name
Symbol
Location
(PCB)
Connector
(pins)
Inter-
mediate
connector
(pins)
Referen
ce
(table)
Air
thermistor
R1T
Main (O/U)
S90:1‑2
-
A
Heat
exchanger
thermistor
R2T
Main (O/U)
S90:3‑4
-
A
Discharge
pipe
thermistor
R3T
Main (O/U)
S90:5‑6
-
A
Heat
exchanger
thermistor
R1T
Main (I/U)
S501:1‑2
-
A
Indoor unit
air (room)
thermistor
R2T
Humidity
sensor PCB
A5P on
main PCB (I/
U)
S600:1‑2
CN1:1‑2 (on
A5P)
A
4
Determine the thermistor resistance that matches the measured
temperature.
Thermistor – Table A
T °C
kΩ
T °C
kΩ
T °C
kΩ
T °C
kΩ
–20
197.81
10
39.96
40
10.63
70
3.44