Check
SiUS121632EA
190
Service Diagnosis
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.
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.
Thermistor temperature
Resistance (k
Ω
)
°C
°F
–20
–4
197.8
–15
5
148.2
–10
14
112.1
–5
23
85.60
0
32
65.93
5
41
51.14
10
50
39.99
15
59
31.52
20
68
25.02
25
77
20.00
30
86
16.10
35
95
13.04
40
104
10.62
45
113
8.707
50
122
7.176
(R25°C (77°F) = 20 k
Ω
, B = 3950 K)
(k
Ω
)
150
100
50
–15
0
15
30
45
(R14467)
5
32
59
86
113
(˚C)
(˚F)
Multimeter
(R20505)
Room temperature
thermistor
Multimeter
Resistance range
Other thermistors
(R23371)
