Troubleshooting Si71-502
52 Troubleshooting
1.17 Thermistor
Error Detection
Method
Remove thermistor and check resistance with tester.
Error Generating
Conditions
Possible Causes
Faulty thermistor
Broken wire
Faulty control PCB
Faulty contact in connector
Troubleshooting
Note: Refer to the thermistor temperature - resistance conversion table when measuring resistance.
Thermistor temperature - resistance conversion table
If measured value deviates significantly from above values, thermistor is faulty.
Use tester to check resistance
NO
YES
Is
resistance
as shown below?
Thermistor is normal.
Remove thermistor
from main unit PCB
(X12A, X13A), and
check resistance
using tester.
If measured value deviates significantly
from values in the table, thermistor is
faulty.
(HF015)
Thermistor
temperature
Sensor resistance Thermistor
temperature
Sensor resistance
-10ºC or less 108kΩ or more 22ºC Approx. 23kΩ
-5ºC Approx. 85kΩ 24ºC Approx. 21kΩ
0ºC Approx. 66kΩ 26ºC Approx. 19kΩ
5ºC Approx. 51kΩ 28ºC Approx. 18kΩ
10ºC Approx. 40kΩ 30ºC Approx. 16kΩ
14ºC Approx. 33kΩ 35ºC Approx. 13kΩ
16ºC Approx. 30kΩ 40ºC Approx. 11kΩ
18ºC Approx. 27kΩ 50ºC or more 7kΩ or less
20ºC Approx. 25kΩ
Continuity check
(HL028)
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