Why Your Furnace May Be Making These Noises

November 23, 2016

Now is when families start turning on their heaters to settle in for a frigid winter. Unfortunately, when some heaters start up, especially if it hasn’t undergone a seasonal heating tune-up, there are some troubles that need to be assessed. A serious problem you may run into is your furnace making unusual noises – read about these furnace noises you should never disregard.

Scraping Sound

If you hear a loud scraping sound that sounds like metal on metal, there is possibly something defective with the blower wheel. If you hear a sound like this, shut off your furnace ASAP and call Strogen's Service Experts Heating & Air Conditioning to inspect the equipment. There are multiple things that could be faulty with the blower wheel. First, it could just be loose and if the piece is not too impaired, can be tightened. Second, it might be that the blower wheel is broken and will require replacement. Or third, it might be that the motor mount actually broke, causing the whole blower assembly to rattle uncontrollably. One of our service professionals would be happy to come out and take a look, and get you back to the quiet and warm home you have come to expect.

Loud Bang When Furnace Starts

If there is a loud bang when your furnace kicks on, there are a couple things that could be occurring. Two common issues are a dirty furnace burner or ignitor. Stretching and contracting air ducts can also create loud bangs after the heating blower turns on. A dirty furnace burner or ignitor could prevent the burners from igniting, forcing gas to build up. When the gas finally ignites, it will create the loud pop you hear. This could result in a safety issue, especially if one of these small explosions caused the heat exchanger to crack. Not only could that produce a carbon monoxide leak, but you will have to replace the heat exchanger, which can be very expensive.

The other issue, extending and contracting air ducts, is a typical noise complaint for people with metal ducts. If your furnace is making the loud boom and it is produced by your air ducts, it could be an indication of undersized ducts, obstructed vents, or a clogged air filter. Strogen's Service Experts Heating & Air Conditioning is happy to visit your home to diagnose your issue and get your home back in working order. Ultimately, this will also provide improved comfort as well.

Whining Noise

If you hear a squealing sound, it could be the blower belt, shaft bearings in need of oil, or even a malfunctioning blower motor. An annual system tune-up will help find these issues before they become serious problems so make sure you contact us at 603-923-4570 and we’ll make sure your furnace is ready to keep you safe and cozy all winter long.

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