Banging, Screeching and Rattling: What 6 Typical Furnace Noises Mean

October 13, 2020

When your furnace is working like it should, it should provide warm air without making too much disruption. While it’s normal to notice your furnace making noise as it begins running, other disruptions are indicating your furnace should get immediate professional support.

Here are some of the most common furnace noises and what they can be indicating. If your furnace is making a strange noise, our friendly heating professionals are here to help with the best furnace repair in Sandpoint, ID.

1. Furnace Making a Banging Noise

You might have an urgent situation on your hands if you’re hearing your furnace making a banging noise. If your furnace is making a knocking noise, it may mean there could be several problems. These include gas building up in your furnace or a ductwork problem.

Banging Sounds Coming from Your Furnace

Your heating system gets dirty as time passes, so that’s why it’s critical to set routine furnace maintenance with Age Heating & Cooling. One of the jobs our techs complete during this service is clean your furnace’s burners. When this part gets dirty, you may hear your furnace making a loud rumbling noise if ignition takes more time. The ensuing gas buildup might fracture your furnace’s heat exchanger, where natural gas turns into heat. Any breaks in it can emit carbon monoxide, which is ordinarily vented outdoors. This dangerous gas can be lethal in large concentrations.

If you’re noticing banging or knocking sounds coming from your furnace, Age Heating & Cooling recommends turning it off and calling us at 208-578-4258. Too much natural gas in your furnace or a fractured heat exchanger are dangerous troubles that require immediate attention.

Banging Sounds Coming from Your Ductwork

Your furnace relies on ductwork to move heated air around your residence. If the ductwork wasn’t designed right or is getting old, it can make a lot of noise when your furnace is heating. This might be the issue if your furnace makes a banging noise when it shuts off. Contact Age Heating & Cooling at 208-578-4258 and we’ll pinpoint the problem.

2. Furnace Making a Buzzing Noise

If you observe your furnace making a buzzing noise, don’t delay calling us. A buzzing sound usually is telling you there’s an electrical issue, like with its transformer, blower motor or capacitor.

Your furnace uses an internal transformer to run on the correct voltage. If wires or the box is loose, you might hear a low humming noise in the furnace when off. Your furnace also uses a blower motor, which sends warm or cooled air across your house, and a capacitor, which starts the motor. If either of these parts are fading, they will buzz when the furnace switches on.

3. Furnace Making a Rattling Noise

If your furnace is making a rattling noise, it may be the result of something minor, like an unsecure screw, or something serious, like a broken piece. In either case, we recommend shutting off your furnace and calling our heating specialists at 208-578-4258 for help.

4. Furnace Making a Squealing Noise

If your furnace makes a high-pitched noise, like squealing, when it’s going, it’s making an effort to tell you it could use some TLC. If you’ve neglected furnace maintenance recently, belts could be worn out or a bearing could need to be greased. We know that maintenance often slips your mind, but our pros can get your furnace operating quietly again rapidly.

5. Furnace Making a Whistling Noise

When you’re noticing your furnace making a whistling noise, it’s frequently due to an air leak in your ductwork. You could also hear whistling while the furnace is operating if a floor vent isn’t secure. If you’ve looked at your vents but are still sensing noise, Age Heating & Cooling can help. It’s essential to get loose ductwork repaired fast, because it can create comfort troubles in your house and inflate your energy bills.

6. Furnace Making a Grinding Noise

It’s not a good sign if you hear your furnace making a grinding noise. This metal-on-metal racket frequently means there’s trouble with your furnace’s blower. Shut down your furnace off immediately and call us at 208-578-4258 for help.

When you’re hearing a strange noise from your furnace, Age Heating & Cooling is ready to help. Contact us at 208-578-4258 to book your furnace repair appointment now.