4 Common Causes of Why Your Furnace Stopped Blowing Hot Air

RTM Design • Aug 17, 2021

4 Common Causes why your Furnace stopped blowing warm air

“You have ONE job!” Yelling at your furnace is tempting and not necessarily wrong. However, it won’t solve why your furnace is not blowing hot air as it should be. So why is your heating system failing to do its sworn duty?

Furnace Not Blowing Hot Air? Here’s Why

You can call Trust 1 Services at any sign of trouble—we may even be able to find a solution to the issue over the phone. Our friendly service technicians are happy to come to your home to find out what’s going on.

However, if your DIY fingers are itching for a project, there are some things you can try to eliminate the issue before picking up the phone. We’ll discuss those and when it’s time to call in a pro in the following rundown of common causes of furnace misfires.

1) Dirty Filter

Your furnace’s air filter is a small but mighty component of your home’s heating and cooling infrastructure. Air filters work with both your air conditioner and furnace and are a line of defense against pollutants, pet dander, and other allergens that try to invade your home.

For many households, replacing your air filter every 90 days will do the trick. However, if you have allergy sufferers or pets in your home, you may need to do this more often. How do you know when to replace your air filter? Start checking before you notice reduced airflow in your ventilation system. Take a look at your filter every 30 days until you figure out what schedule you need to be on to keep your furnace running smoothly (and warmly).

2) Thermostat Set Incorrectly

Perhaps someone really wanted to crank things up, so they set the furnace fan to “On” instead of the “Heat” option. Unfortunately, doing so means that—no matter the current temperature in your home—the fan of your furnace unit will continue to blow without interruption until you change the setting or some other malfunction occurs.

When the furnace successfully heats your home to the temperature you select, it will change the air temperature it puts out. If it didn’t, the temperature in your home would continue to rise unchecked.

Also, make sure to give your furnace a few minutes, especially if turning it on for the first time once the cold season begins. Like a sleepy bear coming out of hibernation, your furnace needs some time to heat the air and get it through the ductwork and into your home.

Side note: Energy Star recommends setting your thermostat to 68 degrees in the winter for the most cost savings for your furnace. What temperature do you keep your thermostat set at in the chilly winter months?

3) Faulty Thermostat

Many homeowners will jump to a worst-case scenario in their minds when their furnace is not blowing hot air. You might lament that you need a complete system replacement when all you really need is to walk to the thermostat and take a look.

There, you could discover that someone accidentally bumped the temperature to a setting lower than where you set it. Or maybe this was an intentional act by a family member who was feeling warm. Either way, save yourself worry by starting with what is usually the simplest solution.

If the temperature setting looks right and the furnace fan is not in the “On” position, there are additional steps you can take before calling in the professionals. One option is to try switching out the batteries in your thermostat. Most thermostats are plastic units clipped onto plastic frames on your wall. Pop off the thermostat, locate the battery compartment, discard the old batteries, and insert the new batteries.

If you have a battery tester and use that before replacing anything, you may disregard the bad battery solution when you see the current charging cylinders still have life left. However, even before the batteries die entirely, they can begin to struggle to power your thermostat. It’s best to go ahead and replace them as a step in your furnace troubleshooting.

4) Extinguished Pilot Light

This common problem only applies to gas-powered furnaces. If you have one, locate the pilot light to see if it’s still burning or has somehow gone out. If it is out, you can reignite it to begin heating your home once again quickly.

We have primarily exhausted the issues that are DIY-able to fix your furnace fiascos. It is best to leave the other common causes of a furnace not blowing warm air to the HVAC contractors at Trust 1 Services. These causes include:

  • Clogged condensate lines
  • Damaged ductwork
  • Inadequate insulation
  • Inadequate gas supply
  • Burner clogs

Don’t fiddle around with your furnace if you lack experience or confidence in doing so.

Trust 1 Services Heating Repair

Winter in the Boston area is no laughing matter—without a properly working furnace, single-digit temps are a significant safety hazard that call for quick heating repair in Quincy, MA. Homeowners trust the pros at Trust 1 Services because we’ll provide you with a free repair estimate and safely execute the service you need to stay warm.

Regular Maintenance Saves the Day

You can avoid many of these common issues for your furnace not blowing hot air altogether by scheduling regular maintenance for your furnace. Believe us—you will kick yourself when you think of all the savings of money, time, and discomfort with a maintenance plan. With a maintenance plan from Trust 1 Services, our techs will inspect your entire heating system to look for abnormalities, clean off grime or debris, and detect trouble spots before they become massive problems.

If you continue to allow a furnace not blowing hot air to run, not only are you making your house cooler, you’re also allowing poorly filtered air particles into your home and creating a safety hazard.

If your valiant attempts to repair the problem did not work, and you have a furnace not blowing hot air in Quincy, MA, call the pros you can trust at Trust 1 Services today at 617-468-3913.

Damaged sewer line

How to Tell if You Need to Replace Your Sewer Line

Sewer maintenance isn’t necessarily at the top of a home or business owner’s priority. The trouble with letting it fall by the wayside, however, is that complex issues can arise. And when they do, they often cost a hefty amount of money to repair. In worst case scenarios, repairs may not be enough and you’ll…

Trenchless equipment

The Advantages of Trenchless Pipe Repair

Trenchless technology is one of the most innovative, time-saving, and cost-effective developments in pipe repair. It saves property owners thousands of dollars in pipe repair expenses each year. And with its minimally-invasive nature, acres of landscaping remain undamaged. Being the leading name for pipe repair in Canton, MA, since 2018, Trust 1 Services has offered…

Leaking water heater

The Common Water Heater Problems You May Need to Fix

While water heaters generally have long lifespans, they can still fail due to various issues. The good news is that with a proactive stance on maintenance, it’s easy to keep your heater in peak condition. Should you experience water heater malfunctions, don’t fret. Turn to Trust 1 Services, the leader in water heater repair in…

Person fanning herself in front of AC unit

Signs and Causes of AC Inefficiency

If your air conditioner is no longer cooling your home as efficiently as it used to, it could be due to several reasons. In this blog post, you will go over the different signs and causes of AC inefficiency. With Trust 1 Services, the leading name for air conditioning repair in Hanover, MA, you can…

repairing basement furnace unit

The Benefits of Regular Furnace Maintenance

Ensuring regular maintenance on your furnace helps it run efficiently during cold weather. Trust 1 Services, the leading name for quality heating installation in Quincy, MA, highlights the main benefits of regular furnace maintenance. Lower Utility Bills With seasonal heating maintenance, your unit will operate more efficiently throughout the year. It can ensure that the…

Flooded bathroom

Plumbing Emergency Prevention Tips

Even though we rely on them on a daily basis, most of us tend to forget about our plumbing systems until something goes amiss. This is a mistake that can lead to a big mess at home or cost you a lot of money. As the premier plumber in Hingham, MA, Trust 1 Services strongly…

Interested in Our HVAC or Plumbing Services?

Please don’t hesitate to get in touch to us. Call us today using the phone number below: