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

October 13, 2020

When your furnace is working correctly, it should deliver warm air without creating too much disruption. While it’s common to hear your furnace making noise as it turns on, other noises are indicating your furnace needs immediate professional support.

Here are some of the most frequent furnace noises and what they could mean. If your furnace is making an atypical noise, our friendly heating specialists are here to assist with the best furnace repair in Williamsport, PA.

1. Furnace Making a Banging Noise

You may have an urgent situation on your hands if you’re noticing your furnace making a banging noise. If your furnace is making a knocking noise, it might indicate there could be a couple of problems. These include gas building up in your furnace or a ductwork problem.

Banging Sounds Coming from Your Furnace

Your heating system turns grimy over the years, so that’s why it’s essential to set annual furnace maintenance with Lycoming Heating Company. One of the things our professionals do during this work is clean your furnace’s burners. When this component gets grimy, you might hear your furnace making a loud rumbling noise after ignition takes more time. The ensuing gas buildup might crack your furnace’s heat exchanger, where natural gas transforms into heat. Any breaks in it can discharge carbon monoxide, which is normally vented outdoors. This toxic gas can be deadly in large concentrations.

If you’re noticing banging or knocking sounds coming from your furnace, Lycoming Heating Company recommends turning it off and reaching us at 570-244-2510. Too much natural gas in your furnace or a fractured heat exchanger are critical issues that should get immediate service.

Banging Sounds Coming from Your Ductwork

Your furnace works with ductwork to move hot air across your house. If the ductwork wasn’t designed correctly or is aging, it can be loud when your furnace runs. This might be the case if your furnace makes a banging noise when it shuts off. Contact Lycoming Heating Company at 570-244-2510 and we’ll determine the problem.

2. Furnace Making a Buzzing Noise

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

Your furnace uses an internal transformer to run on the correct voltage. If wires or the box isn’t tight enough, you might hear a low humming noise in the furnace when off. Your furnace also uses a blower motor, which moves heated or cooled air around your rooms, 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 might be the result of something minor, like an unsecure screw, or something serious, like a broken part. In either case, we advise shutting your furnace off and getting in touch with our heating professionals at 570-244-2510 for support.

4. Furnace Making a Squealing Noise

If your furnace makes a high-pitched noise, like squealing, when it’s on, it’s trying to tell you it could use some TLC. If you’ve forgotten furnace maintenance recently, belts could be worn out or a bearing might need to be lubricated. We realize that maintenance frequently slips your mind, but our professionals can get your furnace running quietly again rapidly.

5. Furnace Making a Whistling Noise

When you’re detecting your furnace making a whistling noise, it’s typically because of an air leak in your ductwork. You might also hear whistling while the furnace is on if a floor vent is loose. If you’ve looked at your vents but are still noticing whistling, Lycoming Heating Company can assist you. It’s essential to get loose ductwork fixed quickly, because it can create comfort troubles in your house and increase 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 racket usually means there’s trouble with your furnace’s blower. Turn off your furnace off instantly and call us at 570-244-2510 for help.

When you’re noticing a weird noise from your furnace, Lycoming Heating Company is ready to provide assistance. Contact us at 570-244-2510 to book your furnace repair appointment today.