Check
SiBE041012_B
110
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 tester.
The relationship between normal temperature and resistance is shown in the table and the
graph below.
The data is for reference purpose only.
When the room temperature thermistor is directly mounted on the display PCB, remove the
display PCB from the control PCB to measure the resistance.
When the connector of the indoor heat exchanger thermistor is soldered on the PCB,
remove the thermistor and measure the resistance.
Thermistor temperature (°C)
Resistance (k
Ω
)
–20
197.8
–15
148.2
–10
112.1
–5
85.60
0
65.93
5
51.14
10
39.99
15
31.52
20
25.02
25
20.00
30
16.10
35
13.04
40
10.62
45
8.707
50
7.176
(R25°C = 20 k
Ω
,
B = 3950 K)
(k
Ω
)
150
100
50
–15
0
15
30
45
(˚C)
(R11905)
Tester
Resistance range
(R11906)
Tester
(R17417)
Room temperature
thermistor
