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Carrier 58DLA090 Thermistor
A thermistor is a certain type of resistor whose resistance is dependent on the thermal temperature. They can tell the heating and cooling system when a temperature has been reached. The control board reads the temperature in a few critical areas to understand what is going on.
Major clues your all-important thermister will not last the year
- The whole HVAC system may not initiate the starting sequence due to any one thermistor that is the problematic one
- Main blower could refuse in the attempt to engage full speed spinning
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