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

When your furnace is running correctly, it should deliver warmth without generating too much disruption. While it’s expected to hear your furnace making noise as it starts up, other noises are signaling your furnace requires immediate professional support.

Here are some of the most common furnace noises and what they could be signaling. If your furnace is making a strange noise, our friendly heating pros are here to help with the best furnace repair in Florissant.

1. Furnace Making a Banging Noise

You may 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 might mean there could be a couple of problems. These involve gas accumulating in your furnace or a ductwork issue.

Banging Sounds Coming from Your Furnace

Your heating system becomes dirty as time passes, so that’s why it’s critical to set seasonal furnace maintenance with B & B Heating & Cooling. One of the jobs our technicians perform during this appointment is clean your furnace’s burners. When this piece gets dirty, you could hear your furnace making a loud rumbling noise if ignition takes more time. The resulting gas buildup might crack your furnace’s heat exchanger, where natural gas turns into warmth. Any cracks in it can leak carbon monoxide, which is normally released outside. This hazardous gas can be fatal in large concentrations.

If you’re hearing banging or knocking sounds coming from your furnace, B & B Heating & Cooling advises turning it off and reaching us at 314-325-7552. Significant natural gas in your furnace or a ruptured heat exchanger are hazardous troubles that should get fast service.

Banging Sounds Coming from Your Ductwork

Your furnace relies on ductwork to move hot air across your home. If the ductwork wasn’t put in properly or is getting old, it can be loud when your furnace is on. This may be the issue if your furnace makes a banging noise when it shuts off. Contact B & B Heating & Cooling at 314-325-7552 and we’ll figure out the problem.

2. Furnace Making a Buzzing Noise

If you observe your furnace making a buzzing noise, don’t wait to call us. A buzzing sound typically indicates an electrical problem, like with its transformer, blower motor or capacitor.

Your furnace depends on an internal transformer to run on the right voltage. If wires or the box needs to be tightened, you may hear a low humming noise in the furnace when off. Your furnace also works with a blower motor, which sends hot or chilly air around your space, and a capacitor, which triggers the motor. If either of these components are failing, they will buzz when the furnace switches on.

3. Furnace Making a Rattling Noise

If your furnace is making a rattling noise, it could be due to something minor, like an unsecure screw, or something major, like a broken component. In either case, we urge you to shut your furnace off and contacting our heating professionals at 314-325-7552 for assistance.

4. Furnace Making a Squealing Noise

If your furnace makes a high-pitched noise, like squealing, when it’s going, it’s attempting to tell you it requires some TLC. If you’ve neglected furnace maintenance recently, belts could be dilapidated or a bearing may need to be lubed. We realize that maintenance frequently slips your mind, but our techs can get your furnace running quietly again quickly.

5. Furnace Making a Whistling Noise

When you’re hearing your furnace making a whistling noise, it’s frequently because of an air leak in your ductwork. You might also notice whistling while the furnace is working if a floor vent is loose. If you’ve examined your vents but are still sensing noise, B & B Heating & Cooling can help. It’s important to get loose ductwork repaired quickly, as it can create comfort troubles in your house and inflate your heating costs.

6. Furnace Making a Grinding Noise

It’s not a positive sign if you notice your furnace making a grinding noise. This metal-on-metal noise typically means there’s trouble with your furnace’s blower. Shut down your furnace off right away and call us at 314-325-7552 for assistance.

When you’re noticing an uncommon noise from your furnace, B & B Heating & Cooling is here to provide assistance. Contact us at 314-325-7552 to schedule your furnace repair appointment right away.

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