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

When your furnace is operating like it should, it should provide heat without making too much disruption. While it’s normal to catch your furnace making noise as it turns on, other noises are signaling your furnace should get immediate professional support.

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

1. Furnace Making a Banging Noise

You may have a serious situation on your hands if you’re noticing your furnace making a banging noise. If your furnace is making a knocking noise, it may mean there could be a few problems. These range from gas accumulating in your furnace or a ductwork issue.

Banging Sounds Coming from Your Furnace

Your heating system turns filthy as time passes, so that’s why it’s important to schedule annual furnace maintenance with Climate Control Systems. One of the jobs our techs do during this appointment is clean your furnace’s burners. When this part gets dirty, you could hear your furnace making a loud rumbling noise after ignition is delayed. The resulting gas buildup can break your furnace’s heat exchanger, where natural gas transforms into warmth. Any breaks in it can discharge carbon monoxide, which is normally emitted outside. This dangerous gas can be lethal in large concentrations.

If you’re aware of banging or knocking sounds coming from your furnace, Climate Control Systems urges you to turn it off and contacting us at 828-283-0369. Significant natural gas in your furnace or a cracked heat exchanger are serious troubles that necessitate immediate service.

Banging Sounds Coming from Your Ductwork

Your furnace works with ductwork to deliver heated air around your home. If the ductwork wasn’t installed properly or is getting dated, it can make a lot of noise when your furnace is on. This could be the case if your furnace makes a banging noise when it shuts off. Contact Climate Control Systems at 828-283-0369 and we’ll figure out the problem.

2. Furnace Making a Buzzing Noise

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

Your furnace depends 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 has a blower motor, which sends warm or cooled air throughout your space, and a capacitor, which turns on the motor. If either of these components 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 can be related to something minor, like an unsecure screw, or something critical, like a broken part. In either case, we urge you to shut your furnace off and calling our heating professionals at 828-283-0369 for help.

4. Furnace Making a Squealing Noise

If your furnace makes a high-pitched noise, like squealing, when it’s on, it’s attempting to tell you it could use some TLC. If you’ve neglected furnace maintenance recently, belts could be worn out or a bearing could need to be lubricated. We know that maintenance sometimes slips your mind, but our professionals 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 due to an air leak in your ductwork. You could also be aware of whistling while the furnace is on if a floor vent isn’t tight. If you’ve checked your vents but are still noticing noise, Climate Control Systems can provide support. It’s important to get loose ductwork fixed quickly, since it can create comfort troubles in your house and drive up your heating expenses.

6. Furnace Making a Grinding Noise

It’s not a positive sign if you hear your furnace making a grinding noise. This metal-on-metal racket usually means there’s a problem with your furnace’s blower. Shut down your furnace off instantly and contact us at 828-283-0369 for help.

When you’re noticing an atypical noise from your furnace, Climate Control Systems is here to support you. Contact us at 828-283-0369 to book your furnace repair appointment right away.

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