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International Comfort Products PAF042K000A Thermistor
A very basic thermistor is a thermal resistor, whose resistance varies depending on the actual temperature is perceives. The furnace or AC must know the temp in several different areas to make a decision on what needs to be done. They tell the heating and cooling system when a certain temperature reaches a certain point.
Some clues the system thermister will need to be replaced
- Blower motor may refuse to begin to get up to full speed
- The AC and heat system may never begin because of the thermistor that has failed
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