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

October 13, 2020

When your furnace is operating correctly, it should deliver warmth without generating too much noise. While it’s common to catch your furnace making noise as it turns on, other sounds are indicating your furnace should get immediate professional help.

Here are some of the most common furnace noises and what they can be indicating. If your furnace is making an atypical noise, our friendly heating specialists are here to help with the best furnace repair in Katy, TX.

1. Furnace Making a Banging Noise

You could have a critical issue on your hands if you’re hearing your furnace making a banging noise. If your furnace is making a knocking noise, it may indicate 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 filthy as time passes, so that’s why it’s important to set seasonal furnace maintenance with Goode Bros AC & Heating. One of the tasks our technicians complete during this service is clean your furnace’s burners. When this part gets dirty, you could hear your furnace making a loud rumbling noise when ignition is delayed. The following gas buildup might fracture your furnace’s heat exchanger, where natural gas turns into warm air. Any cracks in it can emit carbon monoxide, which is normally vented away from your home. This dangerous gas can be lethal in large concentrations.

If you’re noticing banging or knocking sounds coming from your furnace, Goode Bros AC & Heating advises turning it off and calling us at (833)-466-3322. Excessive natural gas in your furnace or a cracked heat exchanger are dangerous issues that should get prompt service.

Banging Sounds Coming from Your Ductwork

Your furnace relies on ductwork to provide hot air around your house. If the ductwork wasn’t installed properly or is getting dated, it can be loud when your furnace is on. This could be the problem if your furnace makes a banging noise when it shuts off. Contact Goode Bros AC & Heating at (833)-466-3322 and we’ll figure out the problem.

2. Furnace Making a Buzzing Noise

If you observe your furnace making a buzzing noise, don’t wait to call us. A buzzing sound often is telling you there’s an electrical issue, like with its transformer, blower motor or capacitor.

Your furnace relies on an internal transformer to work on the correct voltage. If wires or the box isn’t tight enough, you could notice a low humming noise in the furnace when off. Your furnace also has a blower motor, which distributes heated or chilly air around your home, and a capacitor, which turns on the motor. If either of these components are failing, they will buzz when the furnace switches on.

3. Furnace Making a Rattling Noise

If your furnace is making a rattling noise, it might be related to something little, like an unsecure screw, or something major, like a broken part. In either case, we advise shutting your furnace off and calling our heating pros at (833)-466-3322 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 alert you it needs some TLC. If you’ve neglected furnace maintenance the last couple of years, belts could be worn out or a bearing might need to be greased. We know that maintenance sometimes slips your mind, but our professionals can get your furnace operating quietly again quickly.

5. Furnace Making a Whistling Noise

When you’re noticing your furnace making a whistling noise, it’s likely due to an air leak in your ductwork. You may also notice whistling while the furnace is working if a floor vent isn’t tight. If you’ve examined your vents but are still sensing noise, Goode Bros AC & Heating can provide support. It’s important to get loose ductwork taken care of quickly, since it can make comfort problems in your house and inflate your heating bills.

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 typically means there’s an issue with your furnace’s blower. Turn off your furnace off promptly and reach our professionals at (833)-466-3322 for help.

When you’re noticing a weird noise from your furnace, Goode Bros AC & Heating is available to support you. Contact us at (833)-466-3322 to request your furnace repair appointment right away.