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How a Furnace Limit Switch Helps Keep Your Home Safe

Through urban legend and other unreliable means, furnaces have garnered a level of concern around their ability to be safe. While safety should always be taken with any type of combustion system, today’s heating systems are equipped with a number of safety mechanisms and devices, many which are redundant, that ensure your personalized safety. If you have a furnace, one of these safety mechanisms is a component known as the limit switch.

What Is a Limit Switch?

The limit switch is part of your blower assembly and helps with the operation of the blower while also keeping your system safe from overheating. In regard to blower operation, the limit switch is the device that doesn’t allow your blower to start pushing air through your ductwork until the generated heat has reached the correct temperature; this keeps your furnace’s fan from blowing chilly air into your home. The second job of the limit switch has to do with your safety. This is because the limit switch is also equipped to sense when the air around the heat exchanger becomes too hot, and if the switch senses this, it can instantly kill the burner and extinguish all combustion.

Common Problems with the Limit Switch

Should your limit switch malfunction, you may see the following:

  • Constant running of the blower
  • Blower won’t turn on
  • Burner won’t stay lit

Operating your furnace, or attempting to operate the furnace, with a safety mechanism malfunctioning is not advisable as your safety and the safe operation of your system may be at risk. It is also not advisable to try and repair the problem yourself; instead, call an expert for assistance.

If you have questions about the safety mechanisms on your furnace in your Brentwood home, or are experiencing heating issues with your furnace, call Boehmer Heating & Cooling today and schedule an appointment with one of our specialists. We offer professional furnace services in the Brentwood area.

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