What to Do When Your Heater Won’t Turn Off!

It’s not unheard of for heating systems to have a problem once in a while. It could be as straightforward as a broken thermostat or an electrical problem. If your gas furnace won’t shut off, here are a few steps you can take to get a correctly working furnace again. 

Check the Air Filter 

A dirty air filter creates issues for numerous homeowners and their HVAC system. Here’s why. It limits airflow, forcing your furnace to work harder and run longer to satisfy your ideal temperature. 

This increases wear and tear on your furnace, as well as the odds of a breakdown and early failure. 

It can also make your furnace overheat and shut off for a time to cool down. Then it will keep duplicating this process when your furnace turns on. This is known as short cycling. In addition to wearing out your furnace more quickly, it can increase your heating bill and make your home feel uncomfortable. 

We recommend replacing flat filters once a month and pleated filters every three months. If you can’t remember the last time you got a new furnace filter, pull it out and hold it up to the light. If you can’t detect light through your filter, it’s too dusty and you should replace it. 

If the matter was connected to a clogged air filter, replacing it with a fresh filter should solve this common issue when your heat won’t turn off. If not, we recommend checking your thermostat settings next. 

Check Out the Thermostat 

Your thermostat controls your furnace and basically tells the unit when to turn on and off. It’s often the problem when your furnace won’t stop running. 

At times having the heat turn off is as simple as adjusting an incorrect thermostat setting. 

Make Sure Your Thermostat is Set to “Auto”.

Your thermostat has two settings, “auto” and “on,” that control your heating system’s blower motor. 

“Auto” means the furnace blower will only operate when the furnace does. 

“On” means the furnace blower will operate continuously. This constant air flow can help with heat circulation but will also drive up your power bill and increase wear and tear on your furnace. 

If your thermostat is set to “on,” it will seem like your furnace is not turning off, but it’s really just the furnace blower you’re noticing. Switching it to “auto” should solve the problem. It will also help you spend less money on your energy costs. 

Confirm Your Temperature Setting 

If your thermostat won’t turn off heat, compare the temperature setting to the area temperature. If it’s higher than the room air temp, your furnace will keep running until it hits your desired temp. 

Remember that if it’s extremely cold outside, your furnace will have to run much longer than usual to keep your home cozy. This is because of a big temperature difference between the cold air outside and the warm indoors. 

As a check, you can try reducing the thermostat to match the room. Then, wait a couple of minutes. This should make the furnace turn off momentarily. 

Replace the Batteries 

If you use a programmable thermostat, it’s probably battery powered. You can test putting in new batteries to see if that solves the problem. If it doesn’t or if there’s wiring to your electrical system, switch it to “off.” 

If your furnace won’t turn off after you set it to “off,” you will need to cut the power. 

Turn Off the Power 

Thermostat appears to be working fine but your furnace still won’t shut off? There are two places you can shut off the power to your heating unit: at the breaker box and at its specific power switch. 

  1. Go to your breaker box and find the breaker labeled “furnace.” Push the breaker switch to the right to cut power. 
  1. Next, look for the specific power switch to your heating system. It’s similar to a light switch and is located on or near your furnace. Push the switch down to cut power. 
  1. Your furnace should be turned off now. 

If you had to switch off your system at the breaker, call us at 866-397-3787 for professional service, as you may require furnace repair

What Causes a Furnace to Keep Running? 

Sometimes fixing this problem can be as easy as replacing your air filter or changing thermostat settings. In other instances, you might need a professional when your heater won’t shut off. 

Fan Limit Switch Needs Replacing 

The furnace fan limit switch regulates your furnace’s blower motor. If the switch goes bad, it might sound like your furnace running nonstop, even though just the blower is going. 

You might see a furnace error code if there’s a problem with the limit switch. Your furnace will communicate using a blinking red light on the front of your heating system. 

Our Experts can diagnose and fix any problems you’re having with your furnace blower motor. Often this can involve replacement parts, such as the control board, faulty wiring or the fan switch itself. 

Faulty Thermostat 

Like anything else in your home, your thermostat can wear out as time passes and need to be replaced. If it’s time for a new one, ask us about installing a smart thermostat

These thermostats make it simple to save energy, because they create an energy-efficient heating and cooling schedule based on your preferences. Additionally, you’ll be able to adjust and keep tabs on your thermostat from just about anywhere with your phone. 

Air Ducts Are Leaking 

Your furnace uses ductwork to circulate hot air to vents throughout your home. If your home or ductwork is older, your furnace might be operating all the time because the ductwork is leaking hot air in the attic. 

Diagnosing this leaky ductwork and other airflow problems can be difficult to troubleshoot on your own, since it’s hidden behind walls and ceilings. Our Experts can help with diagnosing and taking care of any air duct repair service that you need. 

Depend on Our Experts for All Your Furnace Repair Needs 

Troubleshooting furnace issues can be inconvenient, especially when it affects your comfort, energy efficiency and heating bill. When it comes to furnaces, there’s a reason why we say we’re Experts in our field. You can count on our ACE-certified technicians to resolve your problem quickly and affordably. And what’s even better, we stand behind our HVAC system repairs with a 100% satisfaction guarantee for one year.* Contact us at 866-397-3787 to schedule your appointment now. 

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