It’s easy to misunderstand the complexity of a heating system and the importance of maintenance. Unless you’re a heating specialist yourself, you probably don’t understand all the parts of a furnace. Do you know what the furnace limit switch is? Keep reading to learn about the furnace limit switch. You’ll learn what it is, what it does, and how it impacts the heating system in your Round Rock, Texas, home.

What Is the Limit Switch On a Furnace?

When a furnace starts a heating cycle, there is a period of time in which the burners will start heating up. During this time, the air handler will stay turned off. If it were to come on, it would only blow cool air throughout your home. The limit switch reads the temperature on the heater’s supply plenum. Once it is warm enough, the limit switch will communicate with the air handler. It will tell it to turn on and start distributing warm air throughout the home.

If the limit switch isn’t working properly, this will greatly impact your heater’s ability to effectively heat your home. A faulty limit switch also presents a safety hazard. If the plenum were to get too hot, it could cause the heat exchanger to overheat. The limit switch, however, signals the gas supply to shut off if the plenum gets too hot.

Reasons to Repair a Limit Switch

As the heating system gets older, it’s not uncommon for the limit switch to become faulty. It is imperative that it is fixed as soon as possible. Regular furnace maintenance is key to ensuring that the limit switch is working properly. It will also ensure that small problems with the limit switch are fixed in a timely manner before they become dangerous.

Weathermen Mechanical specializes in furnace repairs. Call us today at 325-455-8621 to learn more about our heating services.

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