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

It’s not unheard of for heating systems to have a glitch every now and then. It could be as simple as a broken thermostat or an electrical problem. If your gas furnace won’t turn off, here are a couple steps you can take to get a properly working furnace again. 

Examine the Air Filter 

A dirty air filter causes problems 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 desired temperature. 

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

It can also make your furnace overheat and shut down 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 drive up 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, remove it and hold it up to the light. If you can’t detect light through your filter, it’s too dirty and you should get a new one. 

If the matter was linked to a clogged air filter, putting in a clean filter should solve this common issue when your heat won’t turn off. If not, we recommend checking your thermostat settings next. 

Check the Thermostat 

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

Sometimes having the heat turn off is as easy as adjusting an incorrect thermostat setting. 

Make Sure Your Thermostat is Set to “Auto”.

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

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

“On” means the furnace blower will operate continuously. This constant air flow can help with heat distribution 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 sound like your furnace is not turning off, but it’s really just the furnace blower you’re noticing. Changing it to “auto” should solve the problem. It will also help you save money on your energy costs. 

Check Your Temperature Setting 

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

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

As a check, you can try decreasing the temperature to correspond with the room. Then, wait a couple of minutes. This should make the furnace turn off in a few minutes. 

Put in New Batteries 

If you have a programmable thermostat, it’s probably battery powered. You can try replacing the batteries to see if that solves the problem. If it doesn’t or if there’s wiring to your electrical system, shift it to “off.” 

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

Cut the Power 

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

  1. Head to your breaker box and locate the breaker labeled “furnace.” Move 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 can be found on or near your furnace. Move the switch down to shut off power. 
  1. Your furnace should be shut off now. 

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

What Causes a Furnace to Keep Running? 

Sometimes correcting this problem can be as simple as replacing your air filter or changing thermostat settings. In other situations, you might need a professional when your heater won’t turn 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 continuously, even though just the blower is going. 

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

Our Experts can diagnose and correct any issues you’re having with your furnace blower motor. Sometimes this can involve replacement parts, like the control board, faulty wiring or the fan switch itself. 

Defective Thermostat 

Like other things 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 getting a smart thermostat

These thermostats make it easy to save energy, because they develop 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. 

Leaky Air Ducts 

Your furnace relies on ductwork to distribute hot air to vents across your home. If your home or ductwork is older, your furnace might be operating constantly because the ductwork is leaking hot air in the attic. 

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

Rely on Our Experts for All Your Furnace Repair Needs 

Troubleshooting furnace problems can be inconvenient, particularly 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 industry. You can depend on our ACE-certified technicians to resolve your problem quickly and affordably. And what’s even better, we back our HVAC system repairs with a 100% satisfaction guarantee for one year.* Contact us at 866-397-3787 to book your appointment now. 

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