Aquatherm at150 OTa- temp sensor error

I don't know what standard 10K thermistor you think you will get on Amazon?

Do you have a parts manual for your Aquatherm AQ150?
 
You can give it a try.

Have you put a multimeter on the temp sensor and see how the resistance varies?


10K_thermistor_chart.png
 
If the ohm reading is off then it confirms the sensor is bad. Otherwise the temp sensor may not be the cause of the problem.
 
Conclusion: the new sensor worked.

The old sensor was reading correct to ambient temp with my MM when I removed it from the pipe however it was giving random fluctuating(high) temp readings at the display and once it showed over 110F it tripped the OTA Error code.. Everything is working flawlessly with the new sensor. Total cost was $13
 
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