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

October 13, 2020

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

Here are some of the most common furnace noises and what they can mean. If your furnace is making a weird noise, our friendly heating specialists are here to assist with the best furnace repair in Perry, GA.

1. Furnace Making a Banging Noise

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

Banging Sounds Coming from Your Furnace

Your heating system gets grimy over time, so that’s why it’s essential to set seasonal furnace maintenance with Gillman Heating and Air. One of the things our technicians complete during this appointment is clean your furnace’s burners. When this piece gets dirty, you could hear your furnace making a loud rumbling noise when ignition takes longer than normal. The subsequent gas buildup can break your furnace’s heat exchanger, where natural gas transforms into heat. Any fractures in it can emit carbon monoxide, which is normally vented outside. This toxic gas can be deadly in large concentrations.

If you’re hearing banging or knocking sounds coming from your furnace, Gillman Heating and Air recommends turning it off and calling us at 478-202-3076. Too much natural gas in your furnace or a cracked heat exchanger are serious troubles that should get prompt repairs.

Banging Sounds Coming from Your Ductwork

Your furnace works with ductwork to provide hot air throughout your residence. If the ductwork wasn’t designed right or is getting old, it can be loud when your furnace is on. This might be the case if your furnace makes a banging noise when it shuts off. Contact Gillman Heating and Air at 478-202-3076 and we’ll determine the problem.

2. Furnace Making a Buzzing Noise

If you observe your furnace making a buzzing noise, don’t hesitate 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 proper voltage. If wires or the box isn’t tight enough, you may detect a low humming noise in the furnace when off. Your furnace also works with a blower motor, which moves heated or cooled air across your space, and a capacitor, which starts the motor. If either of these pieces 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 could be related to something minor, like an unfastened screw, or something major, like a broken component. In either case, we advise shutting your furnace off and getting in touch with our heating professionals at 478-202-3076 for assistance.

4. Furnace Making a Squealing Noise

If your furnace makes a high-pitched noise, like squealing, when it’s running, it’s attempting to alert you it needs some TLC. If you’ve forgotten furnace maintenance recently, belts could be worn out or a bearing could need to be lubed. We know that maintenance sometimes slips your mind, but our pros 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 might also be aware of whistling while the furnace is on if a floor vent isn’t secure. If you’ve checked your vents but are still sensing whistling, Gillman Heating and Air can provide support. It’s critical to get loose ductwork repaired quickly, since it can make comfort troubles in your residence and drive up your energy expenses.

6. Furnace Making a Grinding Noise

It’s not an encouraging sign if you detect your furnace making a grinding noise. This metal-on-metal racket frequently means there’s an issue with your furnace’s blower. Turn off your furnace off immediately and call our pros at 478-202-3076 for help.

When you’re noticing a weird noise from your furnace, Gillman Heating and Air is available to help. Contact us at 478-202-3076 to request your furnace repair appointment today.