Thermistor - Daikin VAM 150FJVE Service Manual

Troubleshooting

1.17 Thermistor

Error Detection
Remove thermistor and check resistance with tester.
Method
Error Generating
Deterioration of thermistor.
Conditions
Possible Causes
Troubleshooting
Note: Refer to the thermistor temperature - resistance conversion table when measuring resistance.
Thermistor temperature - resistance conversion table

Thermistor

temperature
-10°C or less
If measured value deviates significantly from above values, thermistor is faulty.
Use tester to check resistance
50
Faulty thermistor
Broken wire
Faulty control PCB
Faulty contact in connector
Remove thermistor
from main unit PCB
(X12A, X13A), and
check resistance
using tester.
Is
NO
resistance
as shown below?
YES
Thermistor is normal.
Sensor resistance
108kΩ or more
-5°C Approx. 85kΩ
0°C Approx. 66kΩ
5°C Approx. 51kΩ
10°C Approx. 40kΩ
14°C Approx. 33kΩ
16°C Approx. 30kΩ
18°C Approx. 27kΩ
20°C Approx. 25kΩ
Thermistor
temperature
22°C
24°C
26°C
28°C
30°C
35°C
40°C
50°C or more
Continuity check
SiE00-01
If measured value deviates significantly
from values in the table, thermistor is
faulty.
(HF015)
Sensor resistance
Approx. 23kΩ
Approx. 21kΩ
Approx. 19kΩ
Approx. 18kΩ
Approx. 16kΩ
Approx. 13kΩ
Approx. 11kΩ
7kΩ or less
(HL028)
Troubleshooting