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Carrier 39-3SI Thermistor
A thermistor is a thermal resistor, whose resistance will fluctuate depending on the heat. The heating and cooling system must know the temp in several different areas to be sure everything is going well. They convey to the system control board when the temperature in increasing or decreasing.
Signs poorly running all-important thermister
- Primary blower could never begin in the attempt to ramp up to full speed
- The AC and heat system could possibly never start because of the stuck thermistor
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Before buying or purchasing a new Carrier 39-3SI replacement part, do your due diligence and double check the correct model and also make a visual inspection so that you are positive that the correct replacement thermistor is the one being purchased. If you are unsure about the installation of the thermistor by yourself then it may be wise to contact a professional to do the work for you.
Feel free to download your manual for help.
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