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

When your furnace is working properly, it should give warmth without generating too much noise. While it’s normal to notice your furnace making noise as it starts up, other noises are showing your furnace requires immediate professional assistance.

Here are some of the most common furnace noises and what they could be signaling. If your furnace is making a strange noise, our friendly heating pros are here to assist with the best furnace repair in Suffolk/Nassau County.

1. Furnace Making a Banging Noise

You might have a serious problem on your hands if you’re hearing your furnace making a banging noise. If your furnace is making a knocking noise, it might mean there could be a few problems. These range from gas building up in your furnace or a ductwork problem.

Banging Sounds Coming from Your Furnace

Your heating system turns grimy over the years, so that’s why it’s essential to set seasonal furnace maintenance with Airmax Long Island Inc. One of the jobs our techs complete during this work is clean your furnace’s burners. When this piece gets grimy, you may hear your furnace making a loud rumbling noise when ignition takes longer than normal. The resulting gas buildup can break your furnace’s heat exchanger, where natural gas turns into warm air. Any cracks in it can leak carbon monoxide, which is normally released outdoors. This toxic gas can be deadly in large concentrations.

If you’re noticing banging or knocking sounds coming from your furnace, Airmax Long Island Inc urges you to turn it off and calling us at 631-737-5566. Significant natural gas in your furnace or a cracked heat exchanger are serious troubles that necessitate prompt repairs.

Banging Sounds Coming from Your Ductwork

Your furnace relies on ductwork to move warm air across your house. If the ductwork wasn’t designed correctly or is getting dated, it can make a lot of noise when your furnace is heating. This could be the case if your furnace makes a banging noise when it shuts off. Call Airmax Long Island Inc at 631-737-5566 and we’ll determine the problem.

2. Furnace Making a Buzzing Noise

If you hear your furnace making a buzzing noise, don’t delay calling us. A buzzing sound often indicates an electrical issue, 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 may detect a low humming noise in the furnace when off. Your furnace also has a blower motor, which moves hot or chilly air around your residence, and a capacitor, which turns on the motor. If either of these pieces are fading, 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 the result of something minor, like an unfastened screw, or something major, like a broken component. In either case, we advise shutting your furnace off and calling our heating professionals at 631-737-5566 for assistance.

4. Furnace Making a Squealing Noise

If your furnace makes a high-pitched noise, like squealing, when it’s on, it’s trying to get your attention it could use some TLC. If you’ve neglected furnace maintenance the past few years, belts could be worn down or a bearing might need to be lubed. We are aware that maintenance often slips your mind, but our techs can get your furnace operating quietly again fast.

5. Furnace Making a Whistling Noise

When you’re hearing your furnace making a whistling noise, it’s likely because of an air leak in your ductwork. You might also hear whistling while the furnace is operating if a floor vent isn’t tight. If you’ve looked at your vents but are still sensing sound, Airmax Long Island Inc can assist you. It’s essential to get loose ductwork fixed quickly, because it can result in comfort issues in your house and increase your energy expenses.

6. Furnace Making a Grinding Noise

It’s not a positive sign if you detect your furnace making a grinding noise. This metal-on-metal sound frequently means there’s an issue with your furnace’s blower. Shut down your furnace off right away and contact our pros at 631-737-5566 for help.

When you’re noticing a weird noise from your furnace, Airmax Long Island Inc is here to provide assistance. Contact us at 631-737-5566 to schedule your furnace repair appointment today.

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