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

October 13, 2020

When your furnace is running like it should, it should provide heat without creating too much disruption. While it’s common to hear your furnace making noise as it starts up, other disruptions are indicating your furnace needs immediate professional assistance.

Here are some of the most common furnace noises and what they can mean. If your furnace is making an odd noise, our friendly heating pros are here to fix the problem with the best furnace repair in Brookfield, CT.

1. Furnace Making a Banging Noise

You could have a serious problem on your hands if you’re detecting your furnace making a banging noise. If your furnace is making a knocking noise, it can indicate there could be a couple of problems. These include gas increasing in your furnace or a ductwork situation.

Banging Sounds Coming from Your Furnace

Your heating system gets grimy over time, so that’s why it’s important to schedule annual furnace maintenance with Central Air LLC. One of the tasks our pros perform during this service is clean your furnace’s burners. When this piece gets dirty, you may hear your furnace making a loud rumbling noise if ignition takes longer than normal. The subsequent gas buildup might break your furnace’s heat exchanger, where natural gas changes into warm air. Any fractures in it can discharge carbon monoxide, which is regularly released outside. This dangerous gas can be lethal in large concentrations.

If you’re noticing banging or knocking sounds coming from your furnace, Central Air LLC urges you to turn it off and reaching us at 203-357-5913. Too much natural gas in your furnace or a broken heat exchanger are hazardous troubles that necessitate prompt repairs.

Banging Sounds Coming from Your Ductwork

Your furnace relies on ductwork to deliver hot air throughout your residence. If the ductwork wasn’t put in correctly or is getting old, 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 Central Air LLC at 203-357-5913 and we’ll determine the problem.

2. Furnace Making a Buzzing Noise

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

Your furnace depends on an internal transformer to operate on the correct voltage. If wires or the box isn’t tight enough, you could detect a low humming noise in the furnace when off. Your furnace also has a blower motor, which moves hot or cold air across your house, and a capacitor, which triggers the motor. If either of these parts are failing, they will buzz when the furnace switches on.

3. Furnace Making a Rattling Noise

If your furnace is making a rattling noise, it might be the result of something small, like a loose screw, or something serious, like a broken part. In either case, we urge you to shut your furnace off and calling our heating specialists at 203-357-5913 for support.

4. Furnace Making a Squealing Noise

If your furnace makes a high-pitched noise, like squealing, when it’s on, it’s making an effort to tell you it needs some TLC. If you’ve neglected furnace maintenance recently, belts could be dilapidated or a bearing may need to be greased. We are aware that maintenance frequently slips your mind, but our professionals can get your furnace heating quietly again fast.

5. Furnace Making a Whistling Noise

When you’re hearing your furnace making a whistling noise, it’s typically the result of an air leak in your ductwork. You could also hear whistling while the furnace is operating if a floor vent isn’t secure. If you’ve examined your vents but are still noticing sound, Central Air LLC can assist you. It’s important to get loose ductwork taken care of quickly, since it can result in comfort troubles in your home 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 often means there’s an issue with your furnace’s blower. Switch off your furnace off instantly and call our pros at 203-357-5913 for support.

When you’re noticing an uncommon noise from your furnace, Central Air LLC is here to help. Contact us at 203-357-5913 to book your furnace repair appointment today.