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

When your furnace is operating like it should, it should deliver warmth without making too much noise. While it’s expected to hear your furnace making noise as it starts up, other disruptions are signaling your furnace needs immediate professional support.

Here are some of the most frequent furnace noises and what they can be signaling. If your furnace is making a weird noise, our friendly heating specialists are here to help with the best furnace repair in St. Louis.

1. Furnace Making a Banging Noise

You might have a critical situation on your hands if you’re hearing your furnace making a banging noise. If your furnace is making a knocking noise, it might signal there could be a few problems. These range from gas building up 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 routine furnace maintenance with Morgner Inc. Air Conditioning & Heating. One of the things our pros perform during this work is clean your furnace’s burners. When this part gets dirty, you may hear your furnace making a loud rumbling noise if ignition is delayed. The ensuing gas buildup might break your furnace’s heat exchanger, where natural gas turns into warmth. Any cracks in it can emit carbon monoxide, which is normally vented away from your home. This dangerous gas can be lethal in large concentrations.

If you’re aware of banging or knocking sounds coming from your furnace, Morgner Inc. Air Conditioning & Heating urges you to turn it off and reaching us at 314-262-4541. Significant natural gas in your furnace or a cracked heat exchanger are dangerous troubles that necessitate fast attention.

Banging Sounds Coming from Your Ductwork

Your furnace works with ductwork to move warm air across your home. If the ductwork wasn’t designed right or is getting dated, it can make a lot of noise when your furnace is on. This can be the case if your furnace makes a banging noise when it shuts off. Get in touch with Morgner Inc. Air Conditioning & Heating at 314-262-4541 and we’ll figure out 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 often is telling you there’s an electrical situation, 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 needs to be tightened, you may hear a low humming noise in the furnace when off. Your furnace also works with a blower motor, which distributes heated or cooled air across your residence, and a capacitor, which starts the motor. If either of these parts are going out, they will buzz when the furnace switches on.

3. Furnace Making a Rattling Noise

If your furnace is making a rattling noise, it may be due to something small, like an unfastened screw, or something major, like a broken piece. In either case, we recommend shutting off your furnace and contacting our heating specialists at 314-262-4541 for assistance.

4. Furnace Making a Squealing Noise

If your furnace makes a high-pitched noise, like squealing, when it’s heating, it’s making an effort to alert you it requires some TLC. If you’ve forgotten furnace maintenance recently, belts could be worn out or a bearing might need to be greased. We realize that maintenance sometimes slips your mind, but our technicians can get your furnace running quietly again quickly.

5. Furnace Making a Whistling Noise

When you’re hearing your furnace making a whistling noise, it’s frequently because of an air leak in your ductwork. You could also hear whistling while the furnace is on if a floor vent isn’t tight. If you’ve checked your vents but are still hearing whistling, Morgner Inc. Air Conditioning & Heating can help. It’s essential to get loose ductwork fixed fast, as it can result in comfort issues in your residence and drive up your heating bills.

6. Furnace Making a Grinding Noise

It’s not a positive sign if you hear your furnace making a grinding noise. This metal-on-metal racket frequently means there’s a problem with your furnace’s blower. Shut down your furnace off promptly and contact us at 314-262-4541 for help.

When you’re hearing a weird noise from your furnace, Morgner Inc. Air Conditioning & Heating is ready to support you. Contact us at 314-262-4541 to schedule your furnace repair appointment today.

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