4 Furnace Noises and What They Mean

There are a number of furnace noises that are normal, especially when the furnace is just starting up. But, if the noises are excessive, loud, or out of the ordinary, we recommend shutting off the unit and calling a professional. Here are 4 common yet problematic furnace noises and what they typically mean.

1. Loud bang or boom

A loud bang or boom should never be coming from your furnace. This sound may be caused by your furnace having trouble igniting, creating a gas buildup in the combustion chamber which causes a small gas explosion when the furnace finally ignites. A gas burner that is having trouble igniting is an indicator of a clog, gas pressure problem, or a very dirty furnace. This is not something you should try fixing yourself. If you hear this noise, shut off your furnace and contact a licensed technician.

2. High-pitched squealing

If your furnace is making a high-pitched squealing noise, this is usually an indicator of a worn-out blower motor bearing. The bearings wear out from continuous friction from the blower motor during operation. High-pitched squealing can also be caused by insufficient lubrication or a damaged belt. Compared to other furnace repairs, these repairs are pretty minor and inexpensive, but if you are not familiar with the tools or equipment, call a professional.

3. Rattling or rumbling

A loose or broken part inside of your furnace will create a rumble or rattle. As this broken or loose part bangs into other components inside the furnace, it will cause more damage and require additional repairs. Be sure the cause is not as simple as a loose door cover, and if not, shut the system off and call for a furnace repair. Even if you know how to replace the broken part, it is best to get a full unit inspection.

4. Whistling

When your filter is dirty and the airflow running through your furnace is restricted, the air may make a whistling sound as it passes through the narrow openings. This not only creates an annoying sound, but your furnace must work much harder to reach your desired temperature. You’ll be paying a higher-than-necessary utility bill and you are shortening the lifespan of your unit. Always be sure to replace the filter as often as the furnace manufacturer recommends.

Loud or odd noises coming from your furnace are rarely a good thing. It’s always best to heir on the safe side and talk to a professional HVAC specialist. Grand Home Services in Aurora, Colorado provides furnace inspections, repair, cleaning and replacement services throughout the Denver Metro Area. Whether it is an emergency or you need some guidance, do not hesitate to reach out to us! Contact us online or call us today.