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International Comfort Products GPSM30K080F Limit Switch
A normal limit switch has a sensor located in the furnace that makes the determination when the air is actually warm enough so that it may be pushed through the ducts and out the vents. The main reason limit switches are made is due to the fact that if the air never warms up inside the exchanger the you will lose heat in the ducts and the vents will just blow cool air.
Key symptoms to watch for in a bad limit switch
- The heating and AC system will not start or run for any significant length if time
- The International Comfort Products system is beginning to ramp up but then stops from time to time
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