Expand the limits of your furnace knowledge
Your furnace's heater limit switch monitors temperature and shuts down burners when overheating occurs, preventing fire hazards and serious damage to your system.
Schedule annual furnace inspections to keep your limit switch working properly, as regular maintenance helps catch problems before they lead to system failures or safety risks.
Watch for warning signs like your furnace shutting off early, blowers running constantly, or cool air coming from vents, which indicate your limit switch needs attention.
Hiring a local furnace repair professional provides reliable help with limit switch testing and replacement, keeping your heating system safe and preventing overheating problems.
Your heating system is complex, and for good reason—its mechanisms help to maintain a comfortable temperature in your home, even when there is a blizzard outside. One small but important part of your furnace is the limit switch, which prevents overheating. Learn more about what a limit switch on a furnace is and how to tell if it’s malfunctioning.
Your furnace’s limit switch is there for safety. Essentially, the limit switch controls the temperature of the furnace and lowers it if it runs too high. Without a limit switch, your furnace could catch fire or be badly damaged from overheating. Having your furnace limit switch inspected annually is one critical furnace safety tip.
Understanding how a furnace works is key to understanding a limit switch’s function. Here’s a basic breakdown of your furnace’s process:
Your furnace powers up after you turn up your thermostat.
The furnace burners heat air in a chamber called the plenum.
The plenum continues to warm up until it reaches the temperature you set your thermostat to.
Heat is then transferred through your duct system.
Throughout all this, the limit switch monitors the temperature and shuts down the burners if the furnace overheats.
The limit switch also does this by activating a blower fan, which cools the system down to a safe temperature.
Now that you know the importance of the limit switch, learn the signs that indicate it is failing so you can have it repaired ASAP and keep your furnace in good working order. Here are indicators that something is wrong:
The system shuts off before reaching your desired temperature as set on your thermostat.
The furnace blowers run continuously.
Your vents send out cool air instead of heat.
If you are experiencing any of these issues, it could be time to contact a local furnace repair pro. Remember to also schedule regular furnace maintenance and inspections—when a technician can check all components of your furnace and make repairs as needed, your heating system should continue to operate efficiently. The cost for a furnace inspection is $100, on average.
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If your furnace fan keeps running with the thermostat off, it’s likely due to one of these issues. Continue reading to find out what’s up with your furnace fan.
Common types of light switches include single-pole, double-pole, and three-way switches. Keep reading to learn more about the best light switches for your home.
Whether you’ve lost heat or your furnace is making strange sounds, stay calm. Use this guide to determine the source of the problem and your next steps.
Have you ever wondered what a furnace is and what it’s used for? Check out this furnace guide to learn how it works, costs, maintenance tips, and more.
Different types of switches can go beyond the basics of controlling lights. Learn the key differences between a single-pole vs. double-pole switch.
If you’ve noticed cold air blowing out of your vents when the heat is on, you might be able to fix it without calling a pro. Learn how in this guide.
