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

October 13, 2020

When your furnace is running properly, it should deliver heat without generating too much disruption. While it’s normal to hear your furnace making noise as it turns on, other sounds are signaling your furnace requires immediate professional support.

Here are some of the most reported furnace noises and what they might mean. If your furnace is making a strange noise, our friendly heating pros are here to assist with the best furnace repair in Bossier City.

1. Furnace Making a Banging Noise

You may have a critical situation on your hands if you’re noticing your furnace making a banging noise. If your furnace is making a knocking noise, it can signal there could be a couple of problems. These range from gas accumulating in your furnace or a ductwork situation.

Banging Sounds Coming from Your Furnace

Your heating system becomes filthy over the years, so that’s why it’s essential to set seasonal furnace maintenance with Central Aire Heating & A/C Inc. One of the jobs our techs do during this appointment is clean your furnace’s burners. When this piece gets grubby, you may hear your furnace making a loud rumbling noise when ignition takes more time. The resulting gas buildup might fracture your furnace’s heat exchanger, where natural gas changes into warm air. Any breaks in it can emit carbon monoxide, which is ordinarily released outside. This hazardous gas can be lethal in large concentrations.

If you’re noticing banging or knocking sounds coming from your furnace, Central Aire Heating & A/C Inc advises turning it off and reaching us at 318-855-2326. Excessive natural gas in your furnace or a fractured heat exchanger are hazardous problems that necessitate prompt attention.

Banging Sounds Coming from Your Ductwork

Your furnace works with ductwork to deliver heated air around your residence. If the ductwork wasn’t put in right or is getting old, it can make a lot of noise when your furnace is heating. This might be the problem if your furnace makes a banging noise when it shuts off. Call Central Aire Heating & A/C Inc at 318-855-2326 and we’ll pinpoint the problem.

2. Furnace Making a Buzzing Noise

If you notice 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 operate on the proper voltage. If wires or the box needs to be tightened, you might detect a low humming noise in the furnace when off. Your furnace also has a blower motor, which sends hot or cold air across your rooms, and a capacitor, which triggers the motor. If either of these components are going out, they will buzz when the furnace starts.

3. Furnace Making a Rattling Noise

If your furnace is making a rattling noise, it might be related to something small, like an unsecure screw, or something critical, like a broken part. In either case, we urge you to shut your furnace off and contacting our heating pros at 318-855-2326 for help.

4. Furnace Making a Squealing Noise

If your furnace makes a high-pitched noise, like squealing, when it’s heating, it’s trying to alert you it needs some TLC. If you’ve forgotten furnace maintenance the last couple of years, belts could be worn down or a bearing may need to be greased. We are aware that maintenance often slips your mind, but our pros can get your furnace operating quietly again quickly.

5. Furnace Making a Whistling Noise

When you’re detecting your furnace making a whistling noise, it’s typically because of an air leak in your ductwork. You might also be aware of whistling while the furnace is running if a floor vent isn’t tight. If you’ve looked at your vents but are still sensing noise, Central Aire Heating & A/C Inc can assist you. It’s essential to get loose ductwork fixed fast, because it can make comfort issues in your residence and drive up your heating expenses.

6. Furnace Making a Grinding Noise

It’s not a good sign if you detect your furnace making a grinding noise. This metal-on-metal noise often means there’s a problem with your furnace’s blower. Switch off your furnace off instantly and call our pros at 318-855-2326 for help.

When you’re getting an atypical noise from your furnace, Central Aire Heating & A/C Inc is here to provide assistance. Contact us at 318-855-2326 to schedule your furnace repair appointment today.