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Lennox CB30U-21 Thermistor
A thermistor is a type of resistor that has a swinging resistance varies depending on the heat. The main control board needs to know the temperature in certain areas to ensure that things are as they should be. They tell the circuit board when the temperature in increasing or decreasing.
Major signs the Lennox thermister will have to be replaced
- The system blower may fail in the attempt to begin full speed blowing
- No component could never start up because of any malfunctioning thermistor
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If you are going to be buying or ordering any Lennox CB30U-21 part, do your due diligence and cross-check the correct model and also make a visual comparison so that you are positive that the correct thermistor is being ordered. If you are not sure about the installation of the new thermistor on your own then it is probably best to contact a professional to do the replacement of the part.
Feel free to download your manual for help.
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