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

October 13, 2020

When your furnace is operating properly, it should deliver warmth without generating too much sound. While it’s expected to catch your furnace making noise as it starts up, other noises are indicating your furnace should get immediate professional assistance.

Here are some of the most common furnace noises and what they could mean. If your furnace is making a weird noise, our friendly heating specialists are here to fix the problem with the best furnace repair in Portland, OR.

1. Furnace Making a Banging Noise

You could have an urgent situation on your hands if you’re detecting your furnace making a banging noise. If your furnace is making a knocking noise, it may signal there could be several problems. These include gas accumulating in your furnace or a ductwork situation.

Banging Sounds Coming from Your Furnace

Your heating system becomes grimy over the years, so that’s why it’s critical to set annual furnace maintenance with Three Rivers Heating & Cooling. One of the tasks our techs complete during this appointment is clean your furnace’s burners. When this piece gets grubby, you might hear your furnace making a loud rumbling noise if ignition takes more time. The subsequent gas buildup can break your furnace’s heat exchanger, where natural gas transforms into warmth. Any cracks in it can leak carbon monoxide, which is normally released outdoors. This hazardous gas can be deadly in large concentrations.

If you’re noticing banging or knocking sounds coming from your furnace, Three Rivers Heating & Cooling advises turning it off and reaching us at 503-213-4433. Significant natural gas in your furnace or a ruptured heat exchanger are hazardous problems that require fast service.

Banging Sounds Coming from Your Ductwork

Your furnace works with ductwork to deliver heated air across your house. If the ductwork wasn’t installed right or is aging, it can make a lot of noise when your furnace is on. This could be the issue if your furnace makes a banging noise when it shuts off. Contact Three Rivers Heating & Cooling at 503-213-4433 and we’ll determine the problem.

2. Furnace Making a Buzzing Noise

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

Your furnace depends on an internal transformer to work on the right voltage. If wires or the box is loose, you might detect a low humming noise in the furnace when off. Your furnace also has a blower motor, which moves hot or cooled air around your rooms, and a capacitor, which starts the motor. If either of these components are failing, they will buzz when the furnace turns on.

3. Furnace Making a Rattling Noise

If your furnace is making a rattling noise, it could be related to something small, like an unsecure screw, or something serious, like a broken component. In either case, we recommend shutting off your furnace and calling our heating pros at 503-213-4433 for support.

4. Furnace Making a Squealing Noise

If your furnace makes a high-pitched noise, like squealing, when it’s going, it’s attempting to get your attention it requires some TLC. If you’ve skipped furnace maintenance the last couple of years, belts could be worn down or a bearing may need to be lubricated. We know that maintenance often slips your mind, but our professionals can get your furnace running 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 might also be aware of whistling while the furnace is on if a floor vent isn’t secure. If you’ve examined your vents but are still noticing whistling, Three Rivers Heating & Cooling can provide support. It’s essential to get loose ductwork repaired fast, since it can result in comfort issues in your residence and increase your energy bills.

6. Furnace Making a Grinding Noise

It’s not a good sign if you notice your furnace making a grinding noise. This metal-on-metal racket frequently means there’s trouble with your furnace’s blower. Switch off your furnace off now and contact our professionals at 503-213-4433 for assistance.

When you’re hearing a strange noise from your furnace, Three Rivers Heating & Cooling is ready to support you. Contact us at 503-213-4433 to request your furnace repair appointment right away.