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

October 13, 2020

When your furnace is working properly, it should give warmth without generating too much noise. While it’s common to notice your furnace making noise as it starts up, other sounds are signaling your furnace needs immediate professional help.

Here are some of the most common furnace noises and what they might mean. If your furnace is making an atypical noise, our friendly heating specialists are here to assist with the best furnace repair in St. Louis, MO.

1. Furnace Making a Banging Noise

You might have a serious issue on your hands if you’re noticing your furnace making a banging noise. If your furnace is making a knocking noise, it may indicate there could be a few problems. These involve gas accumulating in your furnace or a ductwork situation.

Banging Sounds Coming from Your Furnace

Your heating system turns grimy over the years, so that’s why it’s essential to book annual furnace maintenance with Morgner Inc. Air Conditioning & Heating. One of the jobs our professionals perform during this appointment is clean your furnace’s burners. When this component gets grimy, you may hear your furnace making a loud rumbling noise when ignition is delayed. The resulting gas buildup can fracture your furnace’s heat exchanger, where natural gas transforms into heat. Any breaks in it can emit carbon monoxide, which is ordinarily vented outside. This dangerous gas can be fatal in large concentrations.

If you’re aware of banging or knocking sounds coming from your furnace, Morgner Inc. Air Conditioning & Heating recommends turning it off and calling us at 314-262-4541. Too much natural gas in your furnace or a broken heat exchanger are dangerous problems that necessitate prompt repairs.

Banging Sounds Coming from Your Ductwork

Your furnace works with ductwork to deliver warm air around your residence. If the ductwork wasn’t installed correctly or is getting old, it can be loud when your furnace runs. This may be the problem 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 hear your furnace making a buzzing noise, don’t delay calling us. A buzzing sound frequently means there’s an electrical problem, like with its transformer, blower motor or capacitor.

Your furnace relies on an internal transformer to run on the correct 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 moves warm or cooled air across your home, and a capacitor, which triggers the motor. If either of these pieces are going out, they will buzz when the furnace turns on.

3. Furnace Making a Rattling Noise

If your furnace is making a rattling noise, it might be due to something little, like an unfastened screw, or something serious, like a broken part. In either case, we urge you to shut your furnace off and getting in touch with 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 going, it’s attempting to alert you it needs some TLC. If you’ve skipped furnace maintenance the last couple of years, belts could be dilapidated or a bearing may need to be greased. We know that maintenance frequently slips your mind, but our technicians can get your furnace heating quietly again quickly.

5. Furnace Making a Whistling Noise

When you’re hearing your furnace making a whistling noise, it’s likely due to an air leak in your ductwork. You may also notice whistling while the furnace is on if a floor vent isn’t secure. If you’ve examined your vents but are still hearing noise, Morgner Inc. Air Conditioning & Heating can help. It’s important to get loose ductwork fixed fast, since it can make comfort issues in your residence and increase your utility 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 sound usually means there’s a problem with your furnace’s blower. Turn off your furnace off promptly and call us at 314-262-4541 for assistance.

When you’re getting an atypical noise from your furnace, Morgner Inc. Air Conditioning & Heating is ready to support you. Contact us at 314-262-4541 to request your furnace repair appointment today.