Sounds Like Trouble—4 Furnace Noises You Should Never Ignore

by | Oct 7, 2019

Air Conditioner Repair Tools

When your furnace runs, it’s completely normal for it to hum or even pop. These noises can even be comforting, providing you peace of mind in knowing your system is working. But when it’s louder than usual or it starts making sounds you’ve never heard before, it’s usually because there’s something wrong. Keep your ears open for these furnace noises and know when to call in the experts.


The severity of rattling in a furnace depends on when in the heating process you hear it. We recommend contacting a professional to determine the source of the rattling right away—better to be safe than sorry.


Clicking is normal to hear when your system first kicks on. But if your furnace is constantly clicking when it runs, it could mean something worse, like a bad flame sensor, loose wiring, or a leaking gas valve. Have a professional come in to diagnose and fix your unit right away if the clicking persists.


One of the most annoying furnace noises, metal-on-metal scraping usually indicates something inside your system is loose or there’s a problem with your blower wheel. If that’s the case, your furnace won’t properly heat your home, which could lead to comfort and utility bill issues. Call one of our expert technicians to get this problem straightened out.

A Big Boom

Unlike the noises above that may be more normal, stop what you’re doing and call a professional immediately if you hear your furnace make a loud boom. It could be the result of a small gas explosion, caused by gas building up from delayed furnace ignitions. Turn off your furnace at its source and wait for an expert to diagnose whether it’s time to repair or replace the system.

No Matter the Noise, Our Team Can Help

At Gross Heating & Air Conditioning, we’re no strangers to these and other furnace noises. As a top Carrier® Factory Authorized Dealer, we can pinpoint the problem, make a quick and efficient repair, and handle regular furnace maintenance to help ensure you don’t run into future issues. If you hear strange furnace noises, don’t hesitate to call—262-783-6000.

Gross Heating & Air Conditioning Logo
Gross Heating & Air Conditioning
3260 N. 126th Street
Brookfield, WI 53005
Phone: 262-783-6000
24-Hour Emergency Service Available
Carrier Factory Authorized Dealer Logo
Gross Heating & Air Conditioning Logo