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

October 13, 2020

When your furnace is operating like it should, it should give warmth without making too much noise. While it’s expected to catch your furnace making noise as it turns on, other disruptions are indicating your furnace requires immediate professional help.

Here are some of the most reported furnace noises and what they could be indicating. If your furnace is making a strange noise, our friendly heating pros are here to help with the best furnace repair in Jefferson City, MO.

1. Furnace Making a Banging Noise

You may 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 may signal there could be a couple of problems. These range from gas accumulating in your furnace or a ductwork issue.

Banging Sounds Coming from Your Furnace

Your heating system turns filthy over time, so that’s why it’s important to set routine furnace maintenance with Stieferman Heating Company Inc. One of the tasks our professionals complete 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 is delayed. The ensuing gas buildup might break your furnace’s heat exchanger, where natural gas turns into heat. Any breaks in it can discharge carbon monoxide, which is ordinarily vented outdoors. This toxic gas can be lethal in large concentrations.

If you’re aware of banging or knocking sounds coming from your furnace, Stieferman Heating Company Inc advises turning it off and calling us at 573-203-3908. Excessive natural gas in your furnace or a broken heat exchanger are serious issues that necessitate immediate attention.

Banging Sounds Coming from Your Ductwork

Your furnace uses ductwork to deliver hot air across your house. If the ductwork wasn’t designed right or is aging, it can be loud when your furnace is on. This may be the problem if your furnace makes a banging noise when it shuts off. Contact Stieferman Heating Company Inc at 573-203-3908 and we’ll pinpoint the problem.

2. Furnace Making a Buzzing Noise

If you observe your furnace making a buzzing noise, don’t hesitate to call us. A buzzing sound frequently indicates an electrical situation, like with its transformer, blower motor or capacitor.

Your furnace relies on an internal transformer to work on the correct voltage. If wires or the box is loose, you might detect a low humming noise in the furnace when off. Your furnace also has a blower motor, which sends hot or cooled air across your home, and a capacitor, which turns on the motor. If either of these parts are fading, they will buzz when the furnace starts.

3. Furnace Making a Rattling Noise

If your furnace is making a rattling noise, it could be related to something small, like an unfastened screw, or something serious, like a broken component. In either case, we urge you to shut your furnace off and calling our heating pros at 573-203-3908 for assistance.

4. Furnace Making a Squealing Noise

If your furnace makes a high-pitched noise, like squealing, when it’s running, it’s trying to tell you it could use some TLC. If you’ve neglected furnace maintenance recently, belts could be dilapidated or a bearing might need to be lubed. We realize that maintenance frequently slips your mind, but our technicians 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 typically because of an air leak in your ductwork. You may also hear whistling while the furnace is on if a floor vent isn’t secure. If you’ve examined your vents but are still hearing noise, Stieferman Heating Company Inc can assist you. It’s essential to get loose ductwork fixed without delay, because it can create comfort troubles in your home and drive up your energy bills.

6. Furnace Making a Grinding Noise

It’s not an encouraging sign if you notice your furnace making a grinding noise. This metal-on-metal sound often means there’s a problem with your furnace’s blower. Turn off your furnace off instantly and call us at 573-203-3908 for support.

When you’re hearing a weird noise from your furnace, Stieferman Heating Company Inc is available to support you. Contact us at 573-203-3908 to book your furnace repair appointment right away.