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

October 13, 2020

When your furnace is running correctly, it should provide heat without making too much sound. While it’s normal to catch your furnace making noise as it starts up, other noises are signaling your furnace needs immediate professional support.

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

1. Furnace Making a Banging Noise

You might have a serious problem on your hands if you’re detecting 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 accumulating in your furnace or a ductwork problem.

Banging Sounds Coming from Your Furnace

Your heating system becomes dirty as time passes, so that’s why it’s critical to book seasonal furnace maintenance with Scott Temperature. One of the tasks our techs do during this work is clean your furnace’s burners. When this piece gets dirty, you might hear your furnace making a loud rumbling noise after ignition is delayed. The following gas buildup may break your furnace’s heat exchanger, where natural gas turns into warmth. Any cracks in it can leak carbon monoxide, which is ordinarily emitted outdoors. This hazardous gas can be deadly in large concentrations.

If you’re aware of banging or knocking sounds coming from your furnace, Scott Temperature urges you to turn it off and reaching us at 785-269-0465. Significant natural gas in your furnace or a broken heat exchanger are dangerous troubles that require immediate service.

Banging Sounds Coming from Your Ductwork

Your furnace relies on ductwork to move heated air across your house. If the ductwork wasn’t designed properly or is getting old, it can be loud when your furnace is on. This may be the case if your furnace makes a banging noise when it shuts off. Get in touch with Scott Temperature at 785-269-0465 and we’ll determine 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 relies on an internal transformer to run on the proper voltage. If wires or the box is loose, you may detect a low humming noise in the furnace when off. Your furnace also has a blower motor, which distributes hot or cold air around your house, and a capacitor, which turns on 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 can be the result of something little, like an unfastened screw, or something critical, like a broken component. In either case, we advise shutting your furnace off and getting in touch with our heating specialists at 785-269-0465 for support.

4. Furnace Making a Squealing Noise

If your furnace makes a high-pitched noise, like squealing, when it’s running, it’s attempting to get your attention it could use some TLC. If you’ve forgotten furnace maintenance the past few years, belts could be worn out or a bearing may need to be lubed. We realize that maintenance often slips your mind, but our techs can get your furnace heating quietly again quickly.

5. Furnace Making a Whistling Noise

When you’re noticing your furnace making a whistling noise, it’s frequently because of an air leak in your ductwork. You may also notice whistling while the furnace is running if a floor vent isn’t tight. If you’ve looked at your vents but are still sensing whistling, Scott Temperature can assist you. It’s critical to get loose ductwork fixed quickly, as it can create comfort troubles in your house and inflate your utility costs.

6. Furnace Making a Grinding Noise

It’s not a positive sign if you notice your furnace making a grinding noise. This metal-on-metal sound often means there’s a problem with your furnace’s blower. Shut down your furnace off instantly and contact our professionals at 785-269-0465 for support.

When you’re noticing an atypical noise from your furnace, Scott Temperature is ready to support you. Contact us at 785-269-0465 to schedule your furnace repair appointment now.