Check
SiBE05-722EE
102
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.
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 (°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)
Multimeter
(R19559)
Room temperature
thermistor
Multimeter
Resistance range
(R21542)