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Carrier P4 Thermistor
In an HVAC system, a thermistor is a thermal resistor, which has a resistance that is solely dependent on temperature. The heating system interprets the temperature in a few critical areas to do its job correctly. They inform the system control board when a certain temperature in increasing or decreasing.
Clues to watch for to know the Carrier thermister needs to be replaced
- The main blower could refuse in the attempt to ramp up
- The entire system could possibly not operate due to a thermistor that is malfunctioning
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