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Carrier 58MSA12012120 Thermistor
In an HVAC system, a thermistor is a certain type of resistor that has a swinging resistance is governed by temperature at its location. The system must know the temp in some specific areas of the system to know what to do next. They notify the system control board when a temperature has been reached.
General indicators that your the Carrier thermister is not going to last much longer
- The heating and AC system may never start up due to any one problematic thermistor
- Main blower could never begin in its attempt to engage full speed spinning
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