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

October 13, 2020

When your furnace is working properly, it should give warm air without creating too much disruption. While it’s normal to notice your furnace making noise as it starts up, other sounds are showing your furnace needs immediate professional assistance.

Here are some of the most frequent furnace noises and what they could be indicating. If your furnace is making a strange noise, our friendly heating professionals are here to fix the problem with the best furnace repair in Northglenn.

1. Furnace Making a Banging Noise

You might have a serious problem on your hands if you’re detecting your furnace making a banging noise. If your furnace is making a knocking noise, it may mean there could be several problems. These range from gas accumulating in your furnace or a ductwork issue.

Banging Sounds Coming from Your Furnace

Your heating system becomes grimy over the years, so that’s why it’s critical to schedule annual furnace maintenance with Northglenn Heating & Air Conditioning, Inc.. One of the tasks our techs complete during this service is clean your furnace’s burners. When this component gets grimy, you might hear your furnace making a loud rumbling noise when ignition takes longer than normal. The resulting gas buildup can crack your furnace’s heat exchanger, where natural gas changes into warm air. Any fractures in it can leak carbon monoxide, which is regularly released outdoors. This toxic gas can be lethal in large concentrations.

If you’re aware of banging or knocking sounds coming from your furnace, Northglenn Heating & Air Conditioning, Inc. recommends turning it off and reaching us at 303-452-4146. Excessive natural gas in your furnace or a broken heat exchanger are serious problems that should get fast service.

Banging Sounds Coming from Your Ductwork

Your furnace works with ductwork to move hot air throughout your home. If the ductwork wasn’t installed properly or is getting dated, 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 Northglenn Heating & Air Conditioning, Inc. at 303-452-4146 and we’ll determine 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 frequently indicates an electrical problem, like with its transformer, blower motor or capacitor.

Your furnace depends on an internal transformer to run on the right voltage. If wires or the box is loose, you could notice a low humming noise in the furnace when off. Your furnace also uses a blower motor, which distributes hot or chilly air throughout your space, and a capacitor, which turns on the motor. If either of these components are failing, they will buzz when the furnace starts.

3. Furnace Making a Rattling Noise

If your furnace is making a rattling noise, it could be due to something little, like an unfastened screw, or something critical, like a broken component. In either case, we advise shutting your furnace off and contacting our heating pros at 303-452-4146 for assistance.

4. Furnace Making a Squealing Noise

If your furnace makes a high-pitched noise, like squealing, when it’s on, it’s attempting to tell you it needs some TLC. If you’ve skipped furnace maintenance the last couple of years, belts could be worn down or a bearing may need to be lubricated. We are aware that maintenance frequently slips your mind, but our pros can get your furnace operating quietly again fast.

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 may also notice whistling while the furnace is on if a floor vent isn’t tight. If you’ve looked at your vents but are still noticing sound, Northglenn Heating & Air Conditioning, Inc. can provide support. It’s critical to get loose ductwork repaired quickly, since it can create comfort problems in your residence and increase your heating expenses.

6. Furnace Making a Grinding Noise

It’s not an encouraging 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. Turn off your furnace off now and reach our professionals at 303-452-4146 for help.

When you’re hearing an uncommon noise from your furnace, Northglenn Heating & Air Conditioning, Inc. is here to support you. Contact us at 303-452-4146 to book your furnace repair appointment right away.