Banging, Hissing and Rattling: What Six Common Furnace Sounds Indicate

When your furnace is working like it should, it should deliver warm air without generating too much sound. While it’s expected to notice your furnace making noise as it starts up, other disruptions are indicating your furnace requires immediate professional support.

Here are some of the most reported furnace noises and what they might be indicating. If your furnace is making an odd noise, our friendly heating pros are here to assist with the best furnace repair in South Beloit and Belvidere, Illinois.

1. Furnace Makes a Banging Sound

You could have a critical problem on your hands if you’re hearing your furnace making a banging noise. If your furnace is making a knocking noise, it may mean there could be a few problems. These include gas increasing in your furnace or a ductwork issue.

Banging Sounds Coming from Your Furnace

Your heating system becomes filthy over time, so that’s why it’s critical to set seasonal furnace maintenance with Fleming Heating & Air Conditioning Inc. One of the tasks our techs do during this appointment is clean your furnace’s burners. When this piece gets dirty, you may hear your furnace making a loud rumbling noise when ignition takes more time. The resulting gas buildup can crack your furnace’s heat exchanger, where natural gas turns into warmth. Any fractures in it can emit carbon monoxide, which is normally vented outside. This dangerous gas can be lethal in large concentrations.

If you’re aware of banging or knocking sounds coming from your furnace, Fleming Heating & Air Conditioning Inc urges you to turn it off and calling us at 877-389-2465. Significant natural gas in your furnace or a fractured heat exchanger are hazardous troubles that should get prompt repairs.

Banging Sounds Coming from Your Ductwork

Your furnace works with ductwork to deliver warm air throughout your house. If the ductwork wasn’t installed properly or is getting dated, it can make a lot of noise when your furnace is heating. This might be the problem if your furnace makes a banging noise when it shuts off. Get in touch with Fleming Heating & Air Conditioning Inc at 877-389-2465 and we’ll figure out the problem.

2. Furnace Buzzes Constantly

If you hear your furnace making a buzzing noise, don’t delay calling us. A buzzing sound often indicates 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 notice a low humming noise in the furnace when off. Your furnace also has a blower motor, which moves warm or cooled air across your residence, and a capacitor, which triggers the motor. If either of these parts are failing, they will buzz when the furnace turns on.

3. Furnace Making a Rattling Noise

If your furnace is making a rattling noise, it may be related to something minor, like a loose screw, or something major, like a broken piece. In either case, we recommend shutting off your furnace and calling our heating pros at 877-389-2465 for help.

4. Furnace Squeals

If your furnace makes a high-pitched noise, like squealing, when it’s heating, it’s trying to alert you it requires 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 are aware that maintenance frequently slips your mind, but our techs can get your furnace running quietly again fast.

5. Furnace Making a Whistling Noise

When you’re noticing your furnace making a whistling noise, it’s likely because of an air leak in your ductwork. You might also hear whistling while the furnace is working if a floor vent isn’t secure. If you’ve checked your vents but are still sensing noise, Fleming Heating & Air Conditioning Inc can provide support. It’s essential to get loose ductwork repaired without delay, since it can result in comfort problems in your house and drive up your heating costs.

6. Furnace Makes a Loud, Unpleasant Grinding Noise

It’s not a good sign if you notice your furnace making a grinding noise. This metal-on-metal racket frequently means there’s an issue with your furnace’s blower. Shut down your furnace off instantly and contact our professionals at 877-389-2465 for support.

When you’re hearing a weird noise from your furnace, Fleming Heating & Air Conditioning Inc is available to support you. Contact us at 877-389-2465 to schedule your furnace repair appointment now.