It’s not uncommon for furnaces to emit strange noises. Normal sounds you may hear are tiny little pops or hums as the furnace runs. However, when your furnace is louder than usual and you start hearing startling noises you have never heard before, then it is time to talk to your HVAC technician about some maintenance and repairs. In addition to the banging and thumping, here are some other furnace noises that you should not ignore.

  • Clicking: A clicking noise is normal when you are turning your furnace on and off. However, if the clicking noise continues this could be an indication that something is faulty with the gas, relay, wiring, ignition or even electrical control.
  • Scraping: Hearing a scraping noise from your furnace means it’s highly likely that the blower wheel is in trouble. The scraping noise can occur because it’s possible that the wheel is loose, fallen or has broken entirely.
  • Rattling: A rattling noise from your furnace could be from something as simple as a loose cover panel or a few loose screws. But rattling noises can also be tricky to diagnose as they can also be an indication of a more significant problem with your furnace such as a malfunction in the furnace’s motor or even a leak in the heat exchanger.
  • Squealing: A squealing sound from your furnace is not a good sign and can be the result of a damaged blower belt or blower motor. Squealing could also be a sign that the bearings need some oil.

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