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Lennox CB28UH-060 Thermistor
In an HVAC system, a thermistor is a type of resistor that has a varied resistance that is directly proportioned to temperature at its location. The control board takes the temperature in several different areas to do its job as it should. They tell the main board when a certain temperature in increasing or decreasing.
Signs of a barely functioning system thermister
- The whole HVAC system may not even start depending on which is the thermistor that is stuck open
- Main blower fails to begin to begin full speed blowing
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