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

October 13, 2020

When your furnace is operating properly, it should deliver heat without generating too much noise. While it’s expected to catch your furnace making noise as it begins running, other sounds are signaling your furnace requires immediate professional support.

Here are some of the most common furnace noises and what they might be indicating. If your furnace is making a strange noise, our friendly heating pros are here to assist with the best furnace repair in Zelienople.

1. Furnace Making a Banging Noise

You could have a serious situation on your hands if you’re hearing your furnace making a banging noise. If your furnace is making a knocking noise, it can signal there could be several problems. These range from gas building up in your furnace or a ductwork situation.

Banging Sounds Coming from Your Furnace

Your heating system becomes dirty over the years, so that’s why it’s critical to schedule yearly furnace maintenance with Knoechel Heating Company. One of the jobs our technicians complete during this work is clean your furnace’s burners. When this component gets grimy, you could hear your furnace making a loud rumbling noise if ignition is delayed. The resulting gas buildup might break your furnace’s heat exchanger, where natural gas turns into warm air. Any fractures in it can emit carbon monoxide, which is ordinarily emitted outside. This hazardous gas can be lethal in large concentrations.

If you’re hearing banging or knocking sounds coming from your furnace, Knoechel Heating Company advises turning it off and calling us at 724-425-5852. Too much natural gas in your furnace or a fractured heat exchanger are hazardous issues that necessitate fast repairs.

Banging Sounds Coming from Your Ductwork

Your furnace works with ductwork to deliver hot air around your home. If the ductwork wasn’t put in right or is aging, it can be noisy when your furnace is on. This can be the case if your furnace makes a banging noise when it shuts off. Call Knoechel Heating Company at 724-425-5852 and we’ll determine the problem.

2. Furnace Making a Buzzing Noise

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

Your furnace relies on an internal transformer to work on the proper voltage. If wires or the box isn’t tight enough, you may notice a low humming noise in the furnace when off. Your furnace also has a blower motor, which distributes heated or cooled air around your residence, and a capacitor, which triggers the motor. If either of these components are fading, they will buzz when the furnace starts.

3. Furnace Making a Rattling Noise

If your furnace is making a rattling noise, it might be the result of something little, like an unsecure screw, or something critical, like a broken piece. In either case, we advise shutting your furnace off and contacting our heating professionals at 724-425-5852 for assistance.

4. Furnace Making a Squealing Noise

If your furnace makes a high-pitched noise, like squealing, when it’s going, it’s making an effort to tell you it needs some TLC. If you’ve neglected furnace maintenance the last couple of years, belts could be dilapidated or a bearing might need to be lubricated. We realize that maintenance often slips your mind, but our pros can get your furnace operating quietly again rapidly.

5. Furnace Making a Whistling Noise

When you’re detecting your furnace making a whistling noise, it’s typically 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 checked your vents but are still hearing noise, Knoechel Heating Company can assist you. It’s essential to get loose ductwork taken care of fast, since it can make comfort troubles in your home and inflate your utility expenses.

6. Furnace Making a Grinding Noise

It’s not a positive sign if you detect your furnace making a grinding noise. This metal-on-metal sound often means there’s an issue with your furnace’s blower. Shut down your furnace off promptly and call us at 724-425-5852 for help.

When you’re hearing an uncommon noise from your furnace, Knoechel Heating Company is ready to support you. Contact us at 724-425-5852 to request your furnace repair appointment right away.