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

October 13, 2020

When your furnace is working properly, it should give heat without making too much disruption. While it’s common to catch your furnace making noise as it begins running, other noises are indicating your furnace requires immediate professional support.

Here are some of the most frequent furnace noises and what they might mean. If your furnace is making a weird noise, our friendly heating professionals are here to help with the best furnace repair in Anchorage, AK.

1. Furnace Making a Banging Noise

You might 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 may indicate there could be a few problems. These involve gas increasing in your furnace or a ductwork problem.

Banging Sounds Coming from Your Furnace

Your heating system becomes filthy over time, so that’s why it’s critical to schedule yearly furnace maintenance with Discount Mechanical Heating & Plumbing Services. One of the tasks our pros complete during this work is clean your furnace’s burners. When this component gets grubby, you could hear your furnace making a loud rumbling noise if ignition takes more time. The resulting gas buildup may break your furnace’s heat exchanger, where natural gas transforms into warmth. Any fractures in it can discharge carbon monoxide, which is regularly released away from your home. This hazardous gas can be fatal in large concentrations.

If you’re hearing banging or knocking sounds coming from your furnace, Discount Mechanical Heating & Plumbing Services recommends turning it off and calling us at 907-202-9798. Significant natural gas in your furnace or a ruptured heat exchanger are dangerous troubles that necessitate fast repairs.

Banging Sounds Coming from Your Ductwork

Your furnace relies on ductwork to provide heated air throughout your house. If the ductwork wasn’t installed correctly or is getting old, it can be loud when your furnace is heating. This may be the issue if your furnace makes a banging noise when it shuts off. Contact Discount Mechanical Heating & Plumbing Services at 907-202-9798 and we’ll figure out the problem.

2. Furnace Making a Buzzing Noise

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

Your furnace relies on an internal transformer to work on the proper voltage. If wires or the box is loose, you might notice a low humming noise in the furnace when off. Your furnace also has a blower motor, which distributes warm or cooled air around your home, and a capacitor, which starts the motor. If either of these parts are fading, 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 small, like an unsecure screw, or something serious, like a broken piece. In either case, we advise shutting your furnace off and contacting our heating professionals at 907-202-9798 for support.

4. Furnace Making a Squealing Noise

If your furnace makes a high-pitched noise, like squealing, when it’s heating, it’s making an effort to alert you it requires some TLC. If you’ve skipped furnace maintenance the last couple of years, belts could be worn down or a bearing might need to be greased. We realize that maintenance often slips your mind, but our professionals can get your furnace operating quietly again quickly.

5. Furnace Making a Whistling Noise

When you’re noticing your furnace making a whistling noise, it’s frequently due to an air leak in your ductwork. You may also hear whistling while the furnace is working if a floor vent isn’t secure. If you’ve checked your vents but are still hearing whistling, Discount Mechanical Heating & Plumbing Services can provide support. It’s critical to get loose ductwork fixed quickly, because it can result in comfort issues in your home and drive up your gas expenses.

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 racket typically means there’s trouble with your furnace’s blower. Shut down your furnace off instantly and call our professionals at 907-202-9798 for support.

When you’re getting an atypical noise from your furnace, Discount Mechanical Heating & Plumbing Services is ready to help. Contact us at 907-202-9798 to request your furnace repair appointment now.