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Lennox G40DF Thermistor
In an HVAC system, a thermistor is a thermal resistor, whose resistance fluctuates depending on the actual temperature is perceives. They tell the HVAC system when a temperature has been reached. The system control board interprets the temperature in some specific areas of the system to do its job as it should.
Major warnings of an ailing temp regulating thermister
- The entire system could possibly not operate due to a failed thermistor
- Blower motor could possibly fail to begin to ramp up
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If you are going to be buying or ordering do your best and make sure of the model number and also make a visual comparison in order to be sure the proper replacement thermistor is the one being purchased. There is no rule that says you have to install it yourself. Pay a professional in your area to pay to install it for you.
Feel free to download your manual for help.
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