Daikin FTXA25AW - Page 145

2 | 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 "Checking
procedures"[4144].
No Correctly install the thermistor, see
"Repair procedures"[4148].
To perform an electrical check of the specific thermistor
1 First perform a mechanical check of the thermistor, see "Checking
procedures"[4144].
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