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

When your furnace is working properly, it should deliver warmth without creating too much disruption. While it’s expected to catch your furnace making noise as it starts up, other noises are showing your furnace requires immediate professional help.

Here are some of the most reported furnace noises and what they might be signaling. If your furnace is making an atypical noise, our friendly heating professionals are here to fix the problem with the best furnace repair in Manassas Park.

1. Furnace Making a Banging Noise

You could have an urgent 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 several problems. These involve gas building up in your furnace or a ductwork problem.

Banging Sounds Coming from Your Furnace

Your heating system gets filthy over time, so that’s why it’s critical to schedule seasonal furnace maintenance with Woody's Sudden Service Inc. One of the tasks our pros complete during this appointment is clean your furnace’s burners. When this piece gets dirty, you might hear your furnace making a loud rumbling noise if ignition takes more time. The resulting gas buildup may crack your furnace’s heat exchanger, where natural gas transforms into warmth. Any fractures in it can leak carbon monoxide, which is ordinarily released outdoors. This toxic gas can be lethal in large concentrations.

If you’re noticing banging or knocking sounds coming from your furnace, Woody's Sudden Service Inc recommends turning it off and reaching us at 703-278-2036. Too much natural gas in your furnace or a ruptured heat exchanger are dangerous troubles that necessitate fast repairs.

Banging Sounds Coming from Your Ductwork

Your furnace relies on ductwork to deliver warm air throughout your home. If the ductwork wasn’t put in properly or is aging, it can make a lot of noise when your furnace is on. This may be the case if your furnace makes a banging noise when it shuts off. Contact Woody's Sudden Service Inc at 703-278-2036 and we’ll pinpoint 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 usually indicates an electrical issue, like with its transformer, blower motor or capacitor.

Your furnace uses an internal transformer to work on the proper 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 works with a blower motor, which sends warm or chilly air throughout your house, and a capacitor, which starts 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 could be due to something small, like an unfastened screw, or something critical, like a broken part. In either case, we urge you to shut your furnace off and getting in touch with our heating professionals at 703-278-2036 for support.

4. Furnace Making a Squealing Noise

If your furnace makes a high-pitched noise, like squealing, when it’s going, it’s attempting to alert you it could use some TLC. If you’ve neglected furnace maintenance the past few years, belts could be worn out or a bearing may need to be greased. We know that maintenance sometimes slips your mind, but our professionals can get your furnace heating quietly again quickly.

5. Furnace Making a Whistling Noise

When you’re noticing your furnace making a whistling noise, it’s typically the result of an air leak in your ductwork. You might also notice whistling while the furnace is on if a floor vent isn’t secure. If you’ve checked your vents but are still noticing noise, Woody's Sudden Service Inc can provide support. It’s important to get loose ductwork fixed quickly, since it can result in comfort issues in your house and drive up your utility bills.

6. Furnace Making a Grinding Noise

It’s not a good sign if you hear your furnace making a grinding noise. This metal-on-metal racket frequently means there’s trouble with your furnace’s blower. Switch off your furnace off immediately and reach us at 703-278-2036 for help.

When you’re noticing a weird noise from your furnace, Woody's Sudden Service Inc is ready to help. Contact us at 703-278-2036 to book your furnace repair appointment today.

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