Banging, Screeching and Rattling: What 6 Ordinary Furnace Noises Indicate

October 13, 2020

When your furnace is operating like it should, it should provide heat without creating too much noise. While it’s common to hear your furnace making noise as it starts up, other sounds are showing your furnace needs immediate professional support.

Here are some of the most common furnace noises and what they might be indicating. If your furnace is making a strange noise, our friendly heating pros are here to fix the problem with the best furnace repair in McMurray, PA.

1. Furnace Making a Banging Noise

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

Banging Sounds Coming from Your Furnace

Your heating system gets grimy as time passes, so that’s why it’s important to schedule annual furnace maintenance with Kowalski Heating, Cooling & Plumbing. One of the jobs our techs complete during this appointment is clean your furnace’s burners. When this component gets grimy, you may hear your furnace making a loud rumbling noise when ignition is delayed. The following gas buildup may fracture your furnace’s heat exchanger, where natural gas changes into warmth. Any cracks in it can discharge carbon monoxide, which is regularly emitted outdoors. This dangerous gas can be fatal in large concentrations.

If you’re noticing banging or knocking sounds coming from your furnace, Kowalski Heating, Cooling & Plumbing advises turning it off and contacting us at 724-370-0141. Too much natural gas in your furnace or a ruptured heat exchanger are serious troubles that necessitate prompt attention.

Banging Sounds Coming from Your Ductwork

Your furnace relies on ductwork to move warm air across your house. If the ductwork wasn’t installed right or is aging, it can be loud when your furnace is heating. This could be the problem if your furnace makes a banging noise when it shuts off. Call Kowalski Heating, Cooling & Plumbing at 724-370-0141 and we’ll figure out the problem.

2. Furnace Making a Buzzing Noise

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

Your furnace depends on an internal transformer to work on the proper voltage. If wires or the box is loose, you could detect a low humming noise in the furnace when off. Your furnace also works with a blower motor, which moves warm or cold air throughout your house, and a capacitor, which turns on the motor. If either of these components are fading, they will buzz when the furnace starts.

3. Furnace Making a Rattling Noise

If your furnace is making a rattling noise, it may be the result of something little, like an unfastened screw, or something major, like a broken component. In either case, we recommend shutting off your furnace and contacting our heating specialists at 724-370-0141 for support.

4. Furnace Making a Squealing Noise

If your furnace makes a high-pitched noise, like squealing, when it’s running, it’s making an effort to get your attention it needs some TLC. If you’ve skipped furnace maintenance the past few years, belts could be dilapidated or a bearing could need to be greased. We realize that maintenance often slips your mind, but our professionals can get your furnace operating quietly again fast.

5. Furnace Making a Whistling Noise

When you’re detecting your furnace making a whistling noise, it’s frequently the result of an air leak in your ductwork. You could also be aware of whistling while the furnace is on if a floor vent isn’t tight. If you’ve examined your vents but are still hearing noise, Kowalski Heating, Cooling & Plumbing can assist you. It’s essential to get loose ductwork repaired fast, since it can make comfort issues in your home and inflate your gas expenses.

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 sound typically means there’s an issue with your furnace’s blower. Switch off your furnace off now and reach us at 724-370-0141 for support.

When you’re noticing an uncommon noise from your furnace, Kowalski Heating, Cooling & Plumbing is here to support you. Contact us at 724-370-0141 to book your furnace repair appointment now.