Check; Thermistor Resistance Check - Daikin RX-W Series Service Manual

Check

8. Check

8.1

Thermistor Resistance Check

Check No.01
Measure the resistance of each thermistor using multimeter.
The resistance values are defined by below table.
If the measured resistance value does not match the listed value, the thermistor must be replaced.
 Disconnect the connector of thermistor ASSY from the PCB to measure the resistance between
 To check the thermistor soldered on a PCB, disconnect the PCB from other PCB/parts, and
Thermistor ASSY
Note(s)
When replacing the defective thermistor(s), replace the thermistor as ASSY.
190
the pins using multimeter.
measure the resistance between the both ends of soldered thermistor.
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
(kΩ)
150
100
50
–15 0
5 32
Soldered thermistor
Multimeter
Resistance range
Type A
R (25°C (77°F)) = 20 kΩ
B = 3950 K
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
(°C)
15 30 45
59 86 113 (°F) (R14467)
SiUS092230EA
Multimeter
R6000517
Part 6 Service Diagnosis