Banging, Screeching and Rattling: What 6 Common Furnace Noises Indicate

October 13, 2020

When your furnace is operating properly, it should give warmth without making too much sound. While it’s common to catch your furnace making noise as it begins running, other disruptions are indicating your furnace requires immediate professional support.

Here are some of the most reported furnace noises and what they might be signaling. If your furnace is making a weird noise, our friendly heating specialists are here to assist with the best furnace repair in Elk River, MN.

1. Furnace Making a Banging Noise

You may have an urgent issue on your hands if you’re noticing your furnace making a banging noise. If your furnace is making a knocking noise, it can signal there could be a couple of problems. These involve gas accumulating in your furnace or a ductwork situation.

Banging Sounds Coming from Your Furnace

Your heating system gets grimy as time passes, so that’s why it’s essential to schedule seasonal furnace maintenance with Home Comfort Heating & Air. One of the jobs our pros perform during this service is clean your furnace’s burners. When this part gets dirty, you might hear your furnace making a loud rumbling noise after ignition is delayed. The ensuing gas buildup may fracture your furnace’s heat exchanger, where natural gas transforms into warmth. Any breaks in it can discharge carbon monoxide, which is normally emitted outdoors. This toxic gas can be deadly in large concentrations.

If you’re noticing banging or knocking sounds coming from your furnace, Home Comfort Heating & Air recommends turning it off and contacting us at 763-276-0617. Significant natural gas in your furnace or a broken heat exchanger are critical problems that require prompt repairs.

Banging Sounds Coming from Your Ductwork

Your furnace uses ductwork to deliver hot air across your residence. If the ductwork wasn’t put in properly or is getting old, it can be noisy when your furnace is on. This may be the case if your furnace makes a banging noise when it shuts off. Get in touch with Home Comfort Heating & Air at 763-276-0617 and we’ll pinpoint the problem.

2. Furnace Making a Buzzing Noise

If you hear your furnace making a buzzing noise, don’t wait to call us. A buzzing sound often is telling you there’s an electrical situation, like with its transformer, blower motor or capacitor.

Your furnace depends on an internal transformer to run on the proper voltage. If wires or the box is loose, you may hear a low humming noise in the furnace when off. Your furnace also has a blower motor, which sends warm or chilly air around your space, and a capacitor, which turns on the motor. If either of these pieces are failing, they will buzz when the furnace starts.

3. Furnace Making a Rattling Noise

If your furnace is making a rattling noise, it might be due to something little, like an unfastened screw, or something major, like a broken part. In either case, we urge you to shut your furnace off and getting in touch with our heating pros at 763-276-0617 for assistance.

4. Furnace Making a Squealing Noise

If your furnace makes a high-pitched noise, like squealing, when it’s going, it’s trying to get your attention it requires some TLC. If you’ve neglected furnace maintenance the past few years, belts could be dilapidated or a bearing may need to be lubed. We know that maintenance often slips your mind, but our pros can get your furnace heating quietly again fast.

5. Furnace Making a Whistling Noise

When you’re noticing your furnace making a whistling noise, it’s likely the result of an air leak in your ductwork. You could also notice whistling while the furnace is running if a floor vent is loose. If you’ve looked at your vents but are still sensing noise, Home Comfort Heating & Air can help. It’s important to get loose ductwork fixed without delay, as it can make comfort issues in your home and increase your gas bills.

6. Furnace Making a Grinding Noise

It’s not an encouraging sign if you detect your furnace making a grinding noise. This metal-on-metal racket frequently means there’s a problem with your furnace’s blower. Shut down your furnace off now and contact our pros at 763-276-0617 for support.

When you’re noticing an atypical noise from your furnace, Home Comfort Heating & Air is ready to help. Contact us at 763-276-0617 to book your furnace repair appointment today.