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

October 13, 2020

When your furnace is running like it should, it should provide warm air without creating too much sound. While it’s normal to notice your furnace making noise as it starts up, other noises are indicating your furnace needs immediate professional help.

Here are some of the most frequent furnace noises and what they could be indicating. If your furnace is making an atypical noise, our friendly heating pros are here to help with the best furnace repair in Racine, WI.

1. Furnace Making a Banging Noise

You could have an urgent situation on your hands if you’re noticing your furnace making a banging noise. If your furnace is making a knocking noise, it might indicate there could be a few problems. These range from gas increasing in your furnace or a ductwork situation.

Banging Sounds Coming from Your Furnace

Your heating system gets filthy over the years, so that’s why it’s important to schedule seasonal furnace maintenance with Keystone Heating & Air Conditioning Co., Inc. One of the jobs our technicians do during this service is clean your furnace’s burners. When this component gets grubby, 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 heat. Any cracks in it can emit carbon monoxide, which is normally vented outdoors. This dangerous gas can be fatal in large concentrations.

If you’re noticing banging or knocking sounds coming from your furnace, Keystone Heating & Air Conditioning Co., Inc advises turning it off and calling us at 262-358-9468. Significant natural gas in your furnace or a fractured heat exchanger are hazardous troubles that require prompt repairs.

Banging Sounds Coming from Your Ductwork

Your furnace relies on ductwork to move heated air across your house. If the ductwork wasn’t installed right or is getting dated, it can make a lot of noise when your furnace is on. This might be the issue if your furnace makes a banging noise when it shuts off. Call Keystone Heating & Air Conditioning Co., Inc at 262-358-9468 and we’ll pinpoint the problem.

2. Furnace Making a Buzzing Noise

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

Your furnace relies on an internal transformer to operate on the right voltage. If wires or the box needs to be tightened, you could notice a low humming noise in the furnace when off. Your furnace also uses a blower motor, which distributes warm or cooled air around your space, and a capacitor, which turns on the motor. If either of these pieces are failing, they will buzz when the furnace turns on.

3. Furnace Making a Rattling Noise

If your furnace is making a rattling noise, it may be due to something minor, like a loose screw, or something critical, like a broken piece. In either case, we urge you to shut your furnace off and calling our heating pros at 262-358-9468 for support.

4. Furnace Making a Squealing Noise

If your furnace makes a high-pitched noise, like squealing, when it’s on, it’s attempting to alert you it requires some TLC. If you’ve skipped furnace maintenance the past few years, belts could be worn down or a bearing could need to be lubed. We realize that maintenance sometimes slips your mind, but our pros 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 typically due to an air leak in your ductwork. You could also notice whistling while the furnace is operating if a floor vent is loose. If you’ve looked at your vents but are still sensing noise, Keystone Heating & Air Conditioning Co., Inc can help. It’s critical to get loose ductwork fixed quickly, since it can create comfort problems in your residence and drive up your energy costs.

6. Furnace Making a Grinding Noise

It’s not an encouraging sign if you hear your furnace making a grinding noise. This metal-on-metal sound frequently means there’s trouble with your furnace’s blower. Switch off your furnace off instantly and contact us at 262-358-9468 for help.

When you’re hearing a strange noise from your furnace, Keystone Heating & Air Conditioning Co., Inc is ready to provide assistance. Contact us at 262-358-9468 to schedule your furnace repair appointment now.