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Scrape, Squeal, And Pop? When Your Furnace Is Asking You For Help

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Maintaining your home can be overwhelming, but it is important to protect its function, appeal, and value. While some updates are necessary to enhancing the look of your house, others will keep your home running in an efficient, effective manner. Considering heating and cooling encompasses half of your home's total energy usage, ensuring your heating and air is in proper working condition is essential. Although professionals should complete all repairs, your system will signal when it is in distress. Using this guide on common noises your furnace may make, you will understand when to call in the professionals and how they will repair your heating system.


If you notice a loud scraping noise inside your furnace, there is most likely an issue with the blower wheel. Connected to the blower motor shaft, the blower wheel moves air out of the furnace and into your house. If the wheel is broken or the screw and mounting bracket becomes loose, the metal wheel and blower motor will rub together, causing a noticeable scraping sound.

As soon as you hear this scraping, turn your system off. Make sure there is no power running through your furnace. Technicians will need to inspect the furnace before securing the existing blower wheel with a new mounting bracket and screws. In many cases, a completely new blower wheel will need to be installed.


Your furnace's blower motor is a key part of heating your home. Unfortunately, since it is such an important part of moving heated air into your house, it can wear out over time. If there is an issue with the blower motor, your furnace will not be able to circulate air efficiently. This can increase your energy bills, so understanding the signs that your blower motor is in distress is smart.

If your system is making a high-pitched squealing sign, it may be signaling there is an issue with blower motor. The motor may have stopped functioning altogether, which will require a replacement. In addition, the loud squealing may signify one of the following issues:

  • Belt – A loose or fraying belt on your blower motor can also create this loud squealing noise. Fortunately, reinstalling the existing belt or replacing a worn belt is an inexpensive fix.
  • Bearings – An insufficient amount of lubrication on the motor's bearings can also cause the squealing noise while the furnace is running. Each year, the two motor bearings and two shaft bearings should be oiled. Clean the oil caps around each bearing before applying 2 to 3 drops of lightweight machine oil.  Proper lubrication will not only stop the squealing sound but also ensure your furnace is heating your home efficiently.


A noticeable popping or banging sound from your furnace can be alarming, but it is a simple repair in most cases.

When dirt and debris builds up on the burners of your furnace, it will not be able to ignite when you want to heat your home. This delay in igniting will cause gas to build up, making a popping sound when it finally ignites. Fortunately, regular cleaning and maintenance of your furnace and burners will prevent the buildup of dirt and gas while ensuring your igniters work properly.

Located in the ceilings, walls, crawlspace, and attic of your home, ductwork is essential for moving heated and cooled air into your house. If you have metal ductwork, it may expand and contract as your furnace's blower powers on and off. This expanding and contracting can be noisy, resulting in loud pops and bangs while heating your home. A heating technician will replace clogged air filters, allowing a free flow of air through the duct. Also, opening vents inside your home may decrease the risk of contracting ductwork.

Maintaining your furnace is key to efficient heating of your home. With the help of this guide on furnace distress signals and professional technicians, you will understand when repairs are necessary. If you still have questions, check out websites like or contact a local HVAC company.