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

October 13, 2020

When your furnace is running like it should, it should deliver warm air without generating too much disruption. While it’s common to catch your furnace making noise as it starts up, other noises are indicating your furnace should get immediate professional assistance.

Here are some of the most common furnace noises and what they can be signaling. If your furnace is making an atypical noise, our friendly heating pros are here to help with the best furnace repair in Montoursville, PA.

1. Furnace Making a Banging Noise

You may have an urgent problem on your hands if you’re detecting your furnace making a banging noise. If your furnace is making a knocking noise, it might mean there could be a couple of problems. These involve gas building up in your furnace or a ductwork problem.

Banging Sounds Coming from Your Furnace

Your heating system turns filthy as time passes, so that’s why it’s essential to schedule annual furnace maintenance with Airmen HVAC Service. One of the things our pros complete during this work is clean your furnace’s burners. When this piece gets dirty, you could hear your furnace making a loud rumbling noise after ignition takes more time. The following gas buildup might break your furnace’s heat exchanger, where natural gas transforms into warmth. Any cracks in it can leak carbon monoxide, which is normally vented outdoors. This dangerous gas can be deadly in large concentrations.

If you’re hearing banging or knocking sounds coming from your furnace, Airmen HVAC Service recommends turning it off and calling us at 570-322-3131. Significant natural gas in your furnace or a cracked heat exchanger are critical issues that necessitate prompt service.

Banging Sounds Coming from Your Ductwork

Your furnace relies on ductwork to deliver hot air across your residence. If the ductwork wasn’t designed correctly or is getting old, it can be loud when your furnace is heating. This may be the problem if your furnace makes a banging noise when it shuts off. Call Airmen HVAC Service at 570-322-3131 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 indicates an electrical issue, like with its transformer, blower motor or capacitor.

Your furnace relies on an internal transformer to run on the right voltage. If wires or the box needs to be tightened, you may detect a low humming noise in the furnace when off. Your furnace also has a blower motor, which distributes heated or cooled air around your home, and a capacitor, which starts 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 small, like an unsecure screw, or something major, like a broken piece. In either case, we urge you to shut your furnace off and getting in touch with our heating professionals at 570-322-3131 for help.

4. Furnace Making a Squealing Noise

If your furnace makes a high-pitched noise, like squealing, when it’s going, it’s making an effort to alert you it needs some TLC. If you’ve skipped furnace maintenance recently, belts could be worn out or a bearing could need to be greased. We know that maintenance often slips your mind, but our technicians can get your furnace heating quietly again rapidly.

5. Furnace Making a Whistling Noise

When you’re detecting your furnace making a whistling noise, it’s typically the result of an air leak in your ductwork. You may also be aware of whistling while the furnace is operating if a floor vent isn’t secure. If you’ve examined your vents but are still sensing sound, Airmen HVAC Service can provide support. It’s essential to get loose ductwork taken care of quickly, since it can make comfort troubles in your house and increase your heating costs.

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 usually means there’s a problem with your furnace’s blower. Turn off your furnace off immediately and reach our professionals at 570-322-3131 for assistance.

When you’re getting a strange noise from your furnace, Airmen HVAC Service is here to provide assistance. Contact us at 570-322-3131 to book your furnace repair appointment today.