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

October 13, 2020

When your furnace is working properly, it should deliver warmth without creating too much noise. While it’s common to hear your furnace making noise as it turns on, other disruptions are indicating your furnace needs immediate professional assistance.

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

1. Furnace Making a Banging Noise

You may have a critical issue on your hands if you’re noticing your furnace making a banging noise. If your furnace is making a knocking noise, it can indicate there could be a couple of problems. These range from gas accumulating in your furnace or a ductwork problem.

Banging Sounds Coming from Your Furnace

Your heating system becomes filthy as time passes, so that’s why it’s critical to set seasonal furnace maintenance with Walter's-Eaton's Electric, Plumbing, Heating & AC. One of the tasks our technicians complete 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 takes more time. The following gas buildup can fracture your furnace’s heat exchanger, where natural gas changes into warm air. Any fractures in it can discharge carbon monoxide, which is regularly released outdoors. This hazardous gas can be fatal in large concentrations.

If you’re aware of banging or knocking sounds coming from your furnace, Walter's-Eaton's Electric, Plumbing, Heating & AC recommends turning it off and calling us at 715-318-6728. Significant natural gas in your furnace or a ruptured heat exchanger are dangerous troubles that necessitate immediate repairs.

Banging Sounds Coming from Your Ductwork

Your furnace uses ductwork to provide heated air across your residence. If the ductwork wasn’t installed correctly or is aging, it can be noisy when your furnace is on. This might be the problem if your furnace makes a banging noise when it shuts off. Contact Walter's-Eaton's Electric, Plumbing, Heating & AC at 715-318-6728 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 frequently indicates an electrical issue, like with its transformer, blower motor or capacitor.

Your furnace uses an internal transformer to run on the proper voltage. If wires or the box isn’t tight enough, you might detect a low humming noise in the furnace when off. Your furnace also uses a blower motor, which moves warm or chilly air across your home, and a capacitor, which starts the motor. If either of these components are fading, they will buzz when the furnace turns on.

3. Furnace Making a Rattling Noise

If your furnace is making a rattling noise, it can be related to something small, like an unfastened screw, or something major, like a broken piece. In either case, we recommend shutting off your furnace and getting in touch with our heating specialists at 715-318-6728 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 requires some TLC. If you’ve forgotten furnace maintenance the last couple of years, belts could be worn down or a bearing might need to be lubed. We are aware that maintenance sometimes slips your mind, but our professionals can get your furnace heating quietly again fast.

5. Furnace Making a Whistling Noise

When you’re detecting your furnace making a whistling noise, it’s likely because of an air leak in your ductwork. You may also be aware of whistling while the furnace is operating if a floor vent isn’t tight. If you’ve looked at your vents but are still sensing whistling, Walter's-Eaton's Electric, Plumbing, Heating & AC can help. It’s critical to get loose ductwork taken care of quickly, since it can make comfort issues in your home and increase your utility expenses.

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 typically means there’s a problem with your furnace’s blower. Turn off your furnace off immediately and reach our pros at 715-318-6728 for support.

When you’re hearing an atypical noise from your furnace, Walter's-Eaton's Electric, Plumbing, Heating & AC is ready to support you. Contact us at 715-318-6728 to book your furnace repair appointment now.