When your furnace is operating correctly, it should provide warmth without making too much noise. While it’s common to notice your furnace making noise as it starts up, other sounds are showing your furnace requires immediate professional help.

Here are some of the most common furnace noises and what they might be indicating. If your furnace is making a weird noise, our friendly heating specialists are here to help with the best furnace repair in Manassas, Virginia.

1. Furnace Makes a Banging Sound

You may have a critical 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 a couple of problems. These involve gas accumulating in your furnace or a ductwork issue.

Banging Sounds Coming from Your Furnace

Your heating system turns grimy over time, so that’s why it’s important to set yearly furnace maintenance with Woody's Sudden Service. One of the jobs our techs complete during this service is clean your furnace’s burners. When this piece gets grimy, you could hear your furnace making a loud rumbling noise if ignition is delayed. The subsequent gas buildup can crack your furnace’s heat exchanger, where natural gas transforms into warm air. Any cracks in it can emit carbon monoxide, which is normally released away from your home. This toxic gas can be deadly in large concentrations.

If you’re noticing banging or knocking sounds coming from your furnace, Woody's Sudden Service advises turning it off and calling us at 703-278-2036. Significant natural gas in your furnace or a fractured heat exchanger are serious problems that should get prompt repairs.

Banging Sounds Coming from Your Ductwork

Your furnace relies on ductwork to move hot air throughout your residence. If the ductwork wasn’t designed correctly or is getting dated, it can make a lot of noise when your furnace is on. This could be the case if your furnace makes a banging noise when it shuts off. Call Woody's Sudden Service at 703-278-2036 and we’ll pinpoint the problem.

2. Furnace Buzzes Constantly

If you hear your furnace making a buzzing noise, don’t hesitate to call us. A buzzing sound typically means there’s an electrical problem, like with its transformer, blower motor or capacitor.

Your furnace uses an internal transformer to work on the correct voltage. If wires or the box is loose, you could hear a low humming noise in the furnace when off. Your furnace also has a blower motor, which sends hot or chilly air around your rooms, and a capacitor, which starts the motor. If either of these parts are failing, they will buzz when the furnace starts.

3. Furnace Rattles

If your furnace is making a rattling noise, it may be the result of something small, like an unfastened screw, or something serious, like a broken part. In either case, we urge you to shut your furnace off and contacting our heating professionals at 703-278-2036 for support.

4. Furnace Is Making a High-Pitched Squealing Sound

If your furnace makes a high-pitched noise, like squealing, when it’s going, 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 out or a bearing could need to be greased. We know that maintenance often slips your mind, but our techs can get your furnace operating quietly again quickly.

5. Furnace Making a Whistling Noise

When you’re hearing your furnace making a whistling noise, it’s frequently due to an air leak in your ductwork. You may also hear whistling while the furnace is working if a floor vent is loose. If you’ve checked your vents but are still sensing noise, Woody's Sudden Service can help. It’s essential to get loose ductwork fixed without delay, because it can result in comfort issues in your house and increase your energy costs.

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 noise typically means there’s an issue with your furnace’s blower. Shut down your furnace off instantly and reach our professionals at 703-278-2036 for support.

When you’re noticing a strange noise from your furnace, Woody's Sudden Service is ready to support you. Contact us at 703-278-2036 to schedule your furnace repair appointment now.