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Lennox G40UH Thermistor
A thermistor is a thermal resistor, whose resistance is solely dependent on temperature. They tell the HVAC system when a temperature has been reached. The heating system needs to know the temperature in several different areas to be sure everything is going well.
Major indications your all-important thermister will eventually need to be replaced
- Main blower could never begin to begin to engage full speed
- The AC and heat system may not even begin to function due to any one broken thermistor
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If you are going to be buying or ordering any Lennox G40UH replacement part, do your due diligence and double check the model number and also make a visual inspection so that you are positive that the right thermistor is the one being purchased. The installing of a new thermistor is a piece of cake if you energy and have the proper tools to get it done.
Feel free to download your manual for help.
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