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Carrier 50XL-A42 Thermistor
A very basic thermistor is a type of resistor which has a resistance that is directly proportioned to heat. They convey to the system control board when a certain temperature reaches a certain point. The furnace or AC needs to know the temperature in order to make a decision on what needs to be done.
Symptoms your thermister will not last the year
- The blower could never begin in the attempt to get up to full speed
- The whole HVAC system could possibly not operate due to any one thermistor that is stuck open
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