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Lennox XP14-018 Thermistor
A thermistor is a certain type of resistor whose rated resistance is directly proportioned to temperature at its location. They can tell the system when a certain temperature reaches a certain point. The furnace or AC reads the temperature throughout the whole system to do its job correctly.
Key symptoms to watch for in a bad all-important thermister
- Blower motor could fail to begin to get up to full speed
- The whole system may never begin because of any malfunctioning thermistor
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