Woman reading on a couch

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

When your furnace is running like it should, it should provide warm air without generating too much disruption. While it’s normal to hear your furnace making noise as it begins running, other disruptions are signaling your furnace requires immediate professional help.

Here are some of the most frequent furnace noises and what they could mean. If your furnace is making an odd noise, our friendly heating professionals are here to help with the best furnace repair in Tuscaloosa.

1. Furnace Making a Banging Noise

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

Banging Sounds Coming from Your Furnace

Your heating system becomes grimy over the years, so that’s why it’s critical to book annual furnace maintenance with KDM Service Corporation. One of the tasks our professionals complete during this service is clean your furnace’s burners. When this component gets grimy, you could hear your furnace making a loud rumbling noise after ignition takes more time. The ensuing gas buildup can break your furnace’s heat exchanger, where natural gas turns into heat. Any cracks in it can discharge carbon monoxide, which is ordinarily vented away from your home. This toxic gas can be deadly in large concentrations.

If you’re noticing banging or knocking sounds coming from your furnace, KDM Service Corporation urges you to turn it off and contacting us at 205-208-8090. Excessive natural gas in your furnace or a cracked heat exchanger are critical problems that require fast attention.

Banging Sounds Coming from Your Ductwork

Your furnace uses ductwork to provide warm air across your residence. If the ductwork wasn’t installed correctly or is aging, it can be loud when your furnace is heating. This can be the issue if your furnace makes a banging noise when it shuts off. Get in touch with KDM Service Corporation at 205-208-8090 and we’ll determine the problem.

2. Furnace Making a Buzzing Noise

If you observe your furnace making a buzzing noise, don’t delay calling us. A buzzing sound usually means there’s an electrical issue, like with its transformer, blower motor or capacitor.

Your furnace relies on an internal transformer to operate on the correct voltage. If wires or the box needs to be tightened, you could hear a low humming noise in the furnace when off. Your furnace also has a blower motor, which distributes hot or chilly air around your home, and a capacitor, which turns on the motor. If either of these parts are going out, they will buzz when the furnace starts.

3. Furnace Making a Rattling Noise

If your furnace is making a rattling noise, it might be related to something little, like an unfastened screw, or something major, like a broken component. In either case, we urge you to shut your furnace off and contacting our heating pros at 205-208-8090 for help.

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 neglected furnace maintenance the past few years, belts could be dilapidated or a bearing could need to be lubed. We know that maintenance sometimes slips your mind, but our techs can get your furnace operating quietly again rapidly.

5. Furnace Making a Whistling Noise

When you’re hearing your furnace making a whistling noise, it’s likely due to an air leak in your ductwork. You might also notice whistling while the furnace is operating if a floor vent isn’t secure. If you’ve examined your vents but are still hearing noise, KDM Service Corporation can help. It’s important to get loose ductwork fixed without delay, since it can create comfort troubles in your house and increase your energy expenses.

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 racket often means there’s trouble with your furnace’s blower. Shut down your furnace off immediately and call our professionals at 205-208-8090 for support.

When you’re getting an atypical noise from your furnace, KDM Service Corporation is available to provide assistance. Contact us at 205-208-8090 to schedule your furnace repair appointment now.

Back To Blog