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International Comfort Products GPFM60K100F Thermistor
In an HVAC system, a thermistor is a specific kind of resistor that has a fluctuating resistance that will fluctuate depending on the current temperature. The heating system must know the temp throughout the whole system to make a decision on what needs to be done. They convey to the system when the temperature reaches a certain point.
Indications your thermister is dying
- The main blower could possibly fail to begin to engage full speed spinning
- The entire system may never start up due to any one thermistor that is stuck open
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