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

October 13, 2020

When your furnace is working like it should, it should give warmth without generating too much sound. While it’s common to hear your furnace making noise as it turns on, other sounds are indicating your furnace should get immediate professional assistance.

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

1. Furnace Making a Banging Noise

You may have an urgent 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 increasing in your furnace or a ductwork situation.

Banging Sounds Coming from Your Furnace

Your heating system turns filthy over time, so that’s why it’s important to book annual furnace maintenance with Vogts Heating & Air. One of the jobs our pros do during this appointment is clean your furnace’s burners. When this component gets grubby, you could hear your furnace making a loud rumbling noise after ignition takes longer than normal. The ensuing gas buildup can crack your furnace’s heat exchanger, where natural gas turns into warm air. Any fractures in it can discharge carbon monoxide, which is normally emitted outside. This toxic gas can be deadly in large concentrations.

If you’re noticing banging or knocking sounds coming from your furnace, Vogts Heating & Air advises turning it off and calling us at 208-621-0129. Too much natural gas in your furnace or a broken heat exchanger are critical problems that require fast repairs.

Banging Sounds Coming from Your Ductwork

Your furnace relies on ductwork to move hot air throughout your residence. If the ductwork wasn’t installed right or is getting old, it can be noisy when your furnace runs. This can be the issue if your furnace makes a banging noise when it shuts off. Contact Vogts Heating & Air at 208-621-0129 and we’ll determine 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 frequently indicates an electrical situation, like with its transformer, blower motor or capacitor.

Your furnace uses an internal transformer to work on the correct voltage. If wires or the box needs to be tightened, you might hear a low humming noise in the furnace when off. Your furnace also has a blower motor, which distributes warm or cooled air across your residence, and a capacitor, which turns on the motor. If either of these parts are fading, they will buzz when the furnace turns on.

3. Furnace Making a Rattling Noise

If your furnace is making a rattling noise, it may be due to something minor, like a loose screw, or something critical, like a broken piece. In either case, we urge you to shut your furnace off and calling our heating pros at 208-621-0129 for assistance.

4. Furnace Making a Squealing Noise

If your furnace makes a high-pitched noise, like squealing, when it’s heating, it’s attempting to get your attention it needs some TLC. If you’ve neglected furnace maintenance the past few years, belts could be worn down or a bearing could need to be lubed. We know that maintenance often slips your mind, but our pros can get your furnace heating 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 may also be aware of whistling while the furnace is working if a floor vent isn’t tight. If you’ve examined your vents but are still noticing whistling, Vogts Heating & Air can assist you. It’s critical to get loose ductwork fixed quickly, because it can create comfort problems in your house and inflate your heating 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 often means there’s a problem with your furnace’s blower. Shut down your furnace off instantly and call us at 208-621-0129 for help.

When you’re getting an atypical noise from your furnace, Vogts Heating & Air is here to help. Contact us at 208-621-0129 to schedule your furnace repair appointment right away.