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

October 13, 2020

When your furnace is operating properly, it should deliver warmth without making too much noise. While it’s normal to hear your furnace making noise as it begins running, other noises are showing your furnace needs immediate professional assistance.

Here are some of the most frequent furnace noises and what they might be indicating. If your furnace is making a weird noise, our friendly heating specialists are here to fix the problem with the best furnace repair in Kearney, NE.

1. Furnace Making a Banging Noise

You might have a critical situation on your hands if you’re noticing your furnace making a banging noise. If your furnace is making a knocking noise, it might signal there could be a couple of problems. These involve gas increasing in your furnace or a ductwork situation.

Banging Sounds Coming from Your Furnace

Your heating system gets filthy as time passes, so that’s why it’s critical to schedule routine furnace maintenance with Thurston Heating & Air Conditioning. One of the things our techs perform during this work is clean your furnace’s burners. When this piece gets grubby, you might hear your furnace making a loud rumbling noise after ignition takes longer than normal. The resulting gas buildup may fracture your furnace’s heat exchanger, where natural gas turns into heat. Any fractures in it can emit carbon monoxide, which is ordinarily emitted outside. This toxic gas can be lethal in large concentrations.

If you’re noticing banging or knocking sounds coming from your furnace, Thurston Heating & Air Conditioning advises turning it off and calling us at 308-624-3485. Excessive natural gas in your furnace or a cracked heat exchanger are critical troubles that require immediate service.

Banging Sounds Coming from Your Ductwork

Your furnace relies on ductwork to deliver warm air throughout your house. If the ductwork wasn’t designed properly or is getting old, it can be noisy when your furnace is on. This might be the issue if your furnace makes a banging noise when it shuts off. Contact Thurston Heating & Air Conditioning at 308-624-3485 and we’ll pinpoint the problem.

2. Furnace Making a Buzzing Noise

If you notice your furnace making a buzzing noise, don’t hesitate to call us. A buzzing sound typically is telling you there’s an electrical issue, 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 isn’t tight enough, you could hear a low humming noise in the furnace when off. Your furnace also works with a blower motor, which moves hot or cooled air throughout your space, and a capacitor, which turns on the motor. If either of these parts are failing, they will buzz when the furnace switches on.

3. Furnace Making a Rattling Noise

If your furnace is making a rattling noise, it can be due to something little, like a loose screw, or something critical, like a broken component. In either case, we recommend shutting off your furnace and calling our heating pros at 308-624-3485 for support.

4. Furnace Making a Squealing Noise

If your furnace makes a high-pitched noise, like squealing, when it’s on, it’s trying to get your attention it could use some TLC. If you’ve forgotten furnace maintenance the past few years, belts could be worn down or a bearing might need to be greased. We know that maintenance frequently slips your mind, but our pros can get your furnace operating quietly again fast.

5. Furnace Making a Whistling Noise

When you’re hearing your furnace making a whistling noise, it’s frequently because of an air leak in your ductwork. You may also be aware of whistling while the furnace is running if a floor vent is loose. If you’ve checked your vents but are still hearing whistling, Thurston Heating & Air Conditioning can provide support. It’s important to get loose ductwork taken care of fast, since it can result in comfort problems in your residence and drive up your utility bills.

6. Furnace Making a Grinding Noise

It’s not a good sign if you detect your furnace making a grinding noise. This metal-on-metal noise often means there’s trouble with your furnace’s blower. Turn off your furnace off promptly and call us at 308-624-3485 for help.

When you’re noticing a strange noise from your furnace, Thurston Heating & Air Conditioning is ready to support you. Contact us at 308-624-3485 to schedule your furnace repair appointment right away.