SiUS071735EA
Check
Service Diagnosis
100
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 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)
(R21673)
(˚C)
(k
Ω
)
–15
0
15
30
45
150
100
50
(˚F)
5
32
59
86
113
Multimeter
Resistance range
(R19751)
Summary of Contents for FDMQ-R Series
Page 12: ...SiUS071735EA 1 List of Functions Part 1 List of Functions 1 Functions 2...
Page 14: ...SiUS071735EA 3 Specifications Part 2 Specifications 1 Specifications 4...
Page 120: ...Check SiUS071735EA 109 Service Diagnosis 15 18 24 class R25105 1 2 3 4 Multimeter...
Page 122: ...Check SiUS071735EA 111 Service Diagnosis 15 18 24 class R20704 W V U DC_P1 DC_N1...
Page 140: ...Piping Diagrams SiUS071735EA 129 Appendix RX24RMVJU A 3D092249A...
