Check; Thermistor Resistance Check - Daikin CTXG09QVJUW Service Manual

SiUS121630EA

8. Check

8.1

Thermistor Resistance Check

Check No.01 Disconnect the connectors of the thermistors from the PCB, and measure the resistance of each
thermistor using a multimeter.
The data is for reference purpose only.
Service Diagnosis
Thermistor temperature
°C °F
–20 –4
–15 5
–10 14
–5 23
0 32
5 41
10 50
15 59
20 68
25 77
30 86
35 95
40 104
45 113
50 122
(R25°C (77°F) = 20 kΩ, B = 3950 K)
(kΩ)
150
100
Room temperature
thermistor
Multimeter
(R20505)
When the room temperature thermistor is soldered on a PCB, remove the PCB from the control
PCB to measure the resistance.
When the connector of indoor heat exchanger thermistor is soldered on a PCB, remove the
thermistor and measure the resistance.
Resistance (kΩ)
197.8
148.2
112.1
85.60
65.93
51.14
39.99
31.52
25.02
20.00
16.10
13.04
10.62
8.707
7.176
50
–15 0 15 30
5 32 59 86
Other thermistors
(˚C)
45
(˚F)
113
(R14467)
Multimeter
Resistance range
Check
(R23371)
191