4 Furnace Sounds That Signal Trouble in Sapphire, NC

When your furnace in your Sapphire, NC, home makes loud, unexpected noises, it can be a major cause for concern. An ideal sound level should be minimal to non-existent – something like a low hum that’s barely noticeable. If you’re hearing any of the following four sounds, it can be a sign that your furnace needs professional attention.

Grinding or Scraping Noise

Grinding or scraping noises could indicate that there is an issue with the blower wheel or motor bearings. When these components wear out, they rub against each other and create a loud, unpleasant sound.

The only solution here is to call a professional to replace the damaged parts and properly lubricate the motor bearings. In the meantime, avoid using your furnace to prevent further damage.

Loud Bang

A loud bang from your furnace could be a sign of a dirty burner or delayed ignition. With gas furnaces, over time, dirt and debris can build up on the burner, causing it to become clogged. This can create a delayed ignition, where gas builds up before igniting with a loud bang.

Again, you will need a professional to do a thorough cleaning of the burner and possibly adjust the ignition timing. Fixing it by yourself could lead to more problems like leaks or fire hazards.

Rattling or Banging

If you hear rattling or banging noises coming from your furnace, it could be an indication of loose ductwork or maybe a loose internal component. You can visually inspect the ductwork to see what’s going on, but be sure to turn off the furnace and let it cool down before doing so.


If you haven’t used your furnace for a while when you turn it on, you may hear noises that mimic a bird chirping. This could just be the motor and fan bearings wearing down from lack of use. However, if the noise persists or gets louder, it’s best to have a professional service or replace the motor and fan bearings.

Ultimately, regular maintenance is enough to prevent most furnace noises. But if you do hear any of the above sounds, call us at All Service Heating & Air Conditioning, Inc. for inspection and repairs.

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