Daikin FTXN25KEV1B - Check; Thermistor Resistance Check

SiBE041102_A Check
Service Diagnosis 87
5. Check
5.1 Thermistor Resistance Check
Check No.01 Disconnect the connectors of the thermistors from the PCB, and measure the resistance of
each thermistor using a tester.
The relationship between normal temperature and resistance is shown in the table and the
graphs below.

For models in which the thermistor is directly mounted on the PCB, disconnect the connector
for the PCB and measure.
Thermistor temperature (°C)
Resistance (k
Ω
)
Room temperature thermistor Other thermistors
–20 73.4 211.0
–15 57.0 150.0
–10 44.7 116.5
–5 35.3 88.0
0 28.2 67.2
5 22.6 51.9
10 18.3 40.0
15 14.8 31.8
20 12.1 25.0
25 10.0 20.0
30 8.2 16.0
35 6.9 13.0
40 5.8 10.6
45 4.9 8.7
50 4.1 7.2
(R25°C = 10 k
Ω
, B = 3435 K) (R25°C = 20 k
Ω
, B = 3950 K)
(11952)
Other thermistorsRoom temperature thermistor
(˚C)(˚C)
50
25
0
–15
0
15 30
45
(kΩ)
(kΩ)
–15
0
15 30
45
150
100
50
Tester
Resistance range
(R11906)
RTH1
Tester
(R3460)