Banging, Screeching and Rattling: What 6 Ordinary Furnace Noises Mean

October 13, 2020

When your furnace is running properly, it should provide heat without generating too much disruption. While it’s normal to notice your furnace making noise as it turns on, other sounds are indicating your furnace should get immediate professional support.

Here are some of the most reported furnace noises and what they could be signaling. If your furnace is making a weird noise, our friendly heating specialists are here to help with the best furnace repair in Greater Richmond.

1. Furnace Making a Banging Noise

You could have a serious situation on your hands if you’re detecting your furnace making a banging noise. If your furnace is making a knocking noise, it may indicate there could be several problems. These include gas accumulating in your furnace or a ductwork problem.

Banging Sounds Coming from Your Furnace

Your heating system turns dirty over time, so that’s why it’s critical to schedule yearly furnace maintenance with Herman Allen Plumbing, Heating & Cooling. One of the jobs our techs do during this service is clean your furnace’s burners. When this piece gets dirty, you could hear your furnace making a loud rumbling noise if ignition takes longer than normal. The resulting gas buildup can break your furnace’s heat exchanger, where natural gas changes into heat. Any fractures in it can emit carbon monoxide, which is regularly emitted outdoors. This toxic gas can be deadly in large concentrations.

If you’re hearing banging or knocking sounds coming from your furnace, Herman Allen Plumbing, Heating & Cooling advises turning it off and contacting us at 804-302-6657. Too much natural gas in your furnace or a cracked heat exchanger are serious issues that require prompt repairs.

Banging Sounds Coming from Your Ductwork

Your furnace works with ductwork to deliver warm air throughout your home. If the ductwork wasn’t installed properly or is aging, it can be loud when your furnace runs. This might be the issue if your furnace makes a banging noise when it shuts off. Contact Herman Allen Plumbing, Heating & Cooling at 804-302-6657 and we’ll figure out 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 indicates an electrical situation, like with its transformer, blower motor or capacitor.

Your furnace depends on an internal transformer to operate on the proper voltage. If wires or the box needs to be tightened, you may hear a low humming noise in the furnace when off. Your furnace also works with a blower motor, which distributes heated or cold air across your space, and a capacitor, which triggers the motor. If either of these pieces are fading, they will buzz when the furnace starts.

3. Furnace Making a Rattling Noise

If your furnace is making a rattling noise, it can be due to something minor, like an unsecure screw, or something critical, like a broken part. In either case, we urge you to shut your furnace off and getting in touch with our heating professionals at 804-302-6657 for assistance.

4. Furnace Making a Squealing Noise

If your furnace makes a high-pitched noise, like squealing, when it’s heating, it’s making an effort to alert you it needs some TLC. If you’ve neglected furnace maintenance the last couple of years, belts could be worn out or a bearing may need to be greased. We know that maintenance often slips your mind, but our techs can get your furnace heating quietly again rapidly.

5. Furnace Making a Whistling Noise

When you’re detecting your furnace making a whistling noise, it’s frequently due to an air leak in your ductwork. You might also be aware of whistling while the furnace is working if a floor vent is loose. If you’ve checked your vents but are still sensing sound, Herman Allen Plumbing, Heating & Cooling can help. It’s essential to get loose ductwork fixed fast, because it can create comfort issues in your residence and drive up your gas bills.

6. Furnace Making a Grinding Noise

It’s not an encouraging sign if you hear your furnace making a grinding noise. This metal-on-metal sound frequently means there’s trouble with your furnace’s blower. Switch off your furnace off now and contact us at 804-302-6657 for help.

When you’re getting a strange noise from your furnace, Herman Allen Plumbing, Heating & Cooling is available to provide assistance. Contact us at 804-302-6657 to schedule your furnace repair appointment today.