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Components
Service manual
141
(A)(F)TXF20~71A + FTXF20~25B + (A)(F)TXF20~42C + (A)(F)TXF20~42D +
(A)(F)TXF20~42E + (A)RXF20~71A + RXF20~60B + (A)RXF20~42C +
(A)RXF20~42D + (A)RXF20~42E
Split Sensira R32
ESIE18-12G – 2023.01
1
Locate the thermistor and remove the insulation if needed. Check that the
thermistor is correctly installed and that there is thermal contact between the
thermistor and the piping or ambient (for air thermistor).
Is the thermistor correctly installed
(thermal contact between the
thermistor and the piping)?
Action
Yes
Perform an electrical check of the
specific thermistor, see
140].
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
140].
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
Indoor unit
air (room)
thermistor
R1T
Display PCB
on main
PCB (I/U)
S26:1‑2
S27:1‑2 (on
display PCB)
B
Heat
exchanger
thermistor
R2T
Main (I/U)
S32:1‑2
-
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