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International Comfort Products PGF036L080F Limit Switch
The reason limit switches exist is due to the fact that if the air never warms up inside the exchanger the you will lose all the heat as the air flows through the ducts. A normal limit switch is a type of sensor switch in the air handler that determines when the air is actually warm enough for the air to begin normal home circulation.
Indications of a poorly performing main limit switch
- The heating and AC system will not even start or continue to run for any significant length if time
- The system starts to go through the startup sequence but stops quickly more than once
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