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Testing High Limit Switches


Furnace High Limit Switches, HighTemperature Switches

Sometimes a furnace will not heat your home. When you get to the furnace and check the LED, the light code indicates a high limit open. This is an indication that the furnace has reached a high temperature and tripped the high limit switch. Here’s a short video explaining how a high temp switch works and can be tested.

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About Author

Frank Alexander is an experienced engineering professional who holds a Master of Engineering degree from North Carolina State University and an MBA from the University of South Carolina. Frank holds licenses in both residential and commercial HVAC, and holds a limited electrical license. Frank is also NATE certified.

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