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International Comfort Products NHP242GKA1 Limit Switch
One big reason why limit switches are designed that way is because if the air is too cool inside the furnace to begin with, the you will lose heat in the ducts and the vents will just blow cool air. A normal limit switch has a sensor in the heat exchanger that decides if and when the air is warmed to a point to activate the main blower.
Indications of an ailing limit switch
- The HVAC system begins to go through the startup sequence but stops quickly time after time
- The heating and AC system refuses to start or run like it is supposed to
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