As the furnace cycles, air is pushed through the duct system into your living areas. A dirty filter restricts airflow, causing warm air to back up in the system. This backup of heat causes the metal of your ducts and the furnace itself to expand and bow outward. To correct this cause of furnace banging noises , change the air filter. Make sure to replace filters on a regular schedule, and check them monthly over the winter season.
Filters may fill up at a faster rate due to increased heating system use, requiring more frequent changes. Make sure you always use the right size filter — there should not be significant gaps between the filter and its housing. A incorrectly sized filter can also allow excess dust into your system. There are two primary reasons why your furnace might make a banging sound when starting: Dirty furnace burners.
Regardless of the cause, dirt buildup on your burners will delay the ignition of the gas that is fed to your system. As a result, gas will build up inside of your furnace and when the ignition finally begins, it creates a miniature explosion inside of your system that makes a loud banging sound.
This can be a serious safety issue with your system that can also lead to a cracked heat exchanger. Ducts are popping. This can sometimes create booming or banging sounds when your air handler turns on and the pressure changes inside of your ducts. Those weird and scary furnace sounds can be much more dangerous than any supernatural force you were worried about. From bangs and pops in the ductwork, to whistling and humming while the blower runs, most furnace noises are pretty harmless.
But, there are some more serious noises to be aware of. If you hear a gunshot sound go off when you turn on your furnace, you may have a gas build-up in the system. Never ignore this loud sound coming from the furnace. It could crack the heat exchanger, which is both dangerous and expensive. Turn the system off immediately and call a professional.
Annual fall furnace maintenance will take care of this problem since your technician will inspect and clean the burners as part of the tune-up.
Luckily, there are ways to prevent loud duct noises. Contact a professional HVAC technician to take a look. Solutions may include sealing and insulating ducts, replacing undersized ducts, adjusting dampers, or replacing the air filter.
Turn off your furnace immediately and wait until a professional HVAC technician has had a chance to inspect the system. A rattling sound coming from the furnace can indicate a loose panel or a loose screw. Before attempting to work on your furnace, make sure you turn off power at the source. Then, you can try tightening your panel with a screwdriver to see if that fixes the rattling sound. Here are 3 furnace noises that you should not ignore. If your furnace starts to make scraping noises, especially the sound of metal scraping metal, something is likely loose and needs to be fixed immediately.
There is probably a problem with your blower wheel. If your blower wheel is broken, your furnace will not be able to properly heat your home. Any problems with your blower wheel need to be repaired by a technician. Here are a couple of common reasons why you may hear loud banging or popping coming from your furnace:.
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