Furnace Making Strange Noises

Common Symptoms

Banging or popping sounds at startup

Squealing or screeching during operation

Rumbling after burner shuts off

Rattling or vibrating sounds

Boom sound when igniting

Several factors can contribute to this problem. Understanding the cause helps determine the right solution.

1Delayed ignition (dirty burners)

2Expanding and contracting ductwork

3Loose panels or components

4Worn blower motor bearings

5Belt issues (older furnaces)

6Dirty burners

7Cracked heat exchanger

Before calling a technician, try these simple checks that may resolve the issue.

Tighten loose screws on panels and covers

Replace air filter

Note when noise occurs (startup, running, shutdown)

Listen to identify location of noise

Check for obvious duct movement

Loud bang at ignition (delayed ignition)

Grinding or metal-on-metal sounds

Rumbling that persists

Any noise with burning smell

Cracked heat exchanger suspected

Experiencing any of these situations?

Find noisy furnace solutions specific to your area.