Check
SiMT041311E
181
Service Diagnosis
3. Check
3.1
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 (°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
Resistance range
(R19733)
Multimeter
(R19559)
Room temperature
thermistor