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

October 13, 2020

When your furnace is working properly, it should provide warm air without creating too much sound. While it’s normal to hear your furnace making noise as it begins running, other disruptions are indicating your furnace needs immediate professional assistance.

Here are some of the most frequent furnace noises and what they can mean. If your furnace is making a weird noise, our friendly heating specialists are here to fix the problem with the best furnace repair in Justin, TX.

1. Furnace Making a Banging Noise

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

Banging Sounds Coming from Your Furnace

Your heating system gets grimy over the years, so that’s why it’s critical to set yearly furnace maintenance with Pepper AC & Htg Inc. One of the jobs our technicians do during this appointment is clean your furnace’s burners. When this component gets grimy, you may hear your furnace making a loud rumbling noise if ignition takes more time. The subsequent gas buildup can fracture your furnace’s heat exchanger, where natural gas transforms into warm air. Any breaks in it can discharge carbon monoxide, which is regularly vented outdoors. This hazardous gas can be fatal in large concentrations.

If you’re noticing banging or knocking sounds coming from your furnace, Pepper AC & Htg Inc advises turning it off and calling us at 940-202-1184. Too much natural gas in your furnace or a fractured heat exchanger are hazardous troubles that necessitate prompt repairs.

Banging Sounds Coming from Your Ductwork

Your furnace works with ductwork to deliver heated air across your residence. If the ductwork wasn’t designed correctly or is aging, it can be loud when your furnace runs. This can be the issue if your furnace makes a banging noise when it shuts off. Get in touch with Pepper AC & Htg Inc at 940-202-1184 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 frequently is telling you there’s an electrical situation, 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 is loose, you might notice a low humming noise in the furnace when off. Your furnace also uses a blower motor, which sends heated or cold air across your residence, and a capacitor, which triggers the motor. If either of these pieces are going out, 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 due to something little, like a loose screw, or something critical, like a broken piece. In either case, we advise shutting your furnace off and calling our heating professionals at 940-202-1184 for help.

4. Furnace Making a Squealing Noise

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

5. Furnace Making a Whistling Noise

When you’re detecting your furnace making a whistling noise, it’s typically the result of an air leak in your ductwork. You may also notice whistling while the furnace is on if a floor vent isn’t secure. If you’ve checked your vents but are still hearing whistling, Pepper AC & Htg Inc can assist you. It’s important to get loose ductwork fixed quickly, as it can create comfort troubles in your house and drive up your heating 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 noise often means there’s an issue with your furnace’s blower. Shut down your furnace off promptly and reach us at 940-202-1184 for support.

When you’re noticing a weird noise from your furnace, Pepper AC & Htg Inc is here to help. Contact us at 940-202-1184 to book your furnace repair appointment today.