Thermistor - Daikin VAM 150FAVE Service Manual

Troubleshooting

1.17 Thermistor

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

Thermistor

temperature
-10ºC 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
-5ºC Approx. 85kΩ
0ºC Approx. 66kΩ
5ºC Approx. 51kΩ
10ºC Approx. 40kΩ
14ºC Approx. 33kΩ
16ºC Approx. 30kΩ
18ºC Approx. 27kΩ
20ºC Approx. 25kΩ
Thermistor
temperature
22ºC
24ºC
26ºC
28ºC
30ºC
35ºC
40ºC
50ºC or more
Continuity check
SiE71-202
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