SiBE18-821_C Troubleshooting for RA Indoor Unit
Troubleshooting 361
4.6.2 Thermistor Resistance Check
Check No.06 Disconnect the connectors of the thermistors from the PCB, and measure the resistance of
each thermistor using tester.
The relationship between normal temperature and resistance is shown in the graph and the
table below.
îš„
For the models in which the thermistor is directly mounted on the PCB, disconnect the
connector for the PCB and measure.
Thermistor temperature (°C) Resistance (kΩ)
–20 211.0
–15 150.0
–10 116.5
–5 88.0
067.2
551.9
10 40.0
15 31.8
20 25.0
25 20.0
30 16.0
35 13.0
40 10.6
45 8.7
50 7.2
(R25°C = 20 kΩ, B = 3950 K)
(kΩ)
150
100
50
-15 0 15 30 45
(ËšC)
(R11905)
Tester
Resistance range
(R11906)
RTH1
Tester
(R3460)
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