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The limit switch shuts down the furnace burners if the heat exchanger gets too hot, which can crack heat exchanger pipes and ruin the furnace. And when a heat exchanger cracks, deadly carbon monoxide can and will leak from it into the air in your home.
In this guide, we’ll explain how your furnace high limit switch works, how it impacts your home, and solutions for when it malfunctions. Need your limit switch repaired? We can help.
The furnace limit switch is an essential component because it prevents your furnace from becoming too warm throughout standard operation. This is a safety feature that is designed to prevent damage to the internal components of your furnace and keep your family safe.
In this article, we’ll dive into what a furnace limit switch is, how it works, and why it’s essential for your furnace’s safety. From understanding its role to recognizing signs of malfunction, we have all the information you need to keep your furnace running safely and efficiently.
Are you wondering what a furnace limit switch is and why it's important? A furnace limit switch is a safety device that monitors the temperature within your furnace and turns off the unit if it gets too hot. Learn more about this essential component of your heating system
To safely troubleshoot your furnace limit switch, you'll need to: Turn off your furnace power breaker first. Find your furnace heating duct and use a screwdriver to open its panel. Search the limit switch on the top of the heating duct panel. Open the switch by pulling its body to reveal two metal arms.
Learn the signs of a faulty furnace limit switch and why timely replacement is crucial for safe, efficient heating. Keep your furnace running smoothly with these key tips.
A furnace limit switch is a component of a forced-air furnace that is responsible for turning on the furnace blower once the desired heat has been met inside the furnace. Without a functioning furnace limit switch, a furnace would not be able to regulate the temperature in conjunction with a thermostat.
The furnace high-limit switch is essential for turning on and off domestic heating systems, especially as a safety precaution when the furnace temperature hits dangerous levels. This high-limit switch typically connects to the temperature sensor for the blower motor, effectively serving two important purposes:
The limit switch is located under the supply plenum in your furnace. Its sole job is to read the temperature of that plenum and wait until it hits the appropriate temperature. When the plenum hits that temperature, the limit switch lets the air handler know that it can run, delivering the warm air that you want into your home.