Check
SiUS091601E
101
Service Diagnosis
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 multimeter.
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
Room temperature
thermistor
Other thermistors
–20
–4
73.4 197.8
–15
5
57.0 148.2
–10
14
44.7 112.1
–5
23
35.3 85.60
0
32
28.2 65.93
5
41
22.6 51.14
10
50
18.3 39.99
15
59
14.8 31.52
20
68
12.1 25.02
25
77
10.0 20.00
30
86
8.2 16.10
35
95
6.9 13.04
40
104
5.8 10.62
45
113
4.9 8.707
50
122
4.1 7.176
(R25°C (77°F) = 10 k
Ω
,
B = 3435 K)
(R25°C (77°F) = 20 k
Ω
,
B = 3950 K)
Room temperature thermistor
(˚C)
(˚F)
50
25
0
–15
5
32
59
86
113
0
15
30
45
(k
Ω
)
(R21673)
Other thermistors
(˚C)
(k
Ω
)
–15
0
15
30
45
150
100
50
(˚F)
5
32
59
86
113
Multimeter
Resistance range
(R19751)
Multimeter
(R20505)
Room temperature
thermistor
Summary of Contents for FTX09NMVJU
Page 12: ...SiUS091601E 1 List of Functions Part 1 List of Functions 1 Functions 2...
Page 15: ...SiUS091601E Specifications 4 Part 2 Specifications 1 Specifications 5...
Page 65: ...SiUS091601E Remote Controller 54 Part 5 Remote Controller 1 FTX Series 55 2 FVXS Series 57...
Page 144: ...Revision History Month Year Version Revised contents 02 2016 SiUS091601E First edition...
