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

When your furnace is working correctly, it should give warmth without creating too much disruption. While it’s common to hear your furnace making noise as it starts up, other sounds are showing your furnace requires immediate professional help.

Here are some of the most reported furnace noises and what they could be indicating. If your furnace is making an atypical noise, our friendly heating specialists are here to fix the problem with the best furnace repair in Grand Prairie.

1. Furnace Making a Banging Noise

You might have a critical issue on your hands if you’re hearing your furnace making a banging noise. If your furnace is making a knocking noise, it may signal there could be a few problems. These range from gas increasing 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 important to set seasonal furnace maintenance with Mustang Mechanical. One of the things our techs do during this service is clean your furnace’s burners. When this part gets grubby, you may hear your furnace making a loud rumbling noise after ignition takes more time. The following gas buildup can break your furnace’s heat exchanger, where natural gas changes into heat. Any breaks in it can leak carbon monoxide, which is normally released outdoors. This dangerous gas can be fatal in large concentrations.

If you’re aware of banging or knocking sounds coming from your furnace, Mustang Mechanical recommends turning it off and calling us at 972-445-9504. Excessive natural gas in your furnace or a broken heat exchanger are dangerous troubles that require immediate service.

Banging Sounds Coming from Your Ductwork

Your furnace works with ductwork to deliver warm air around your house. If the ductwork wasn’t put in correctly or is getting old, it can be loud when your furnace is on. This can be the case if your furnace makes a banging noise when it shuts off. Call Mustang Mechanical at 972-445-9504 and we’ll pinpoint 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 uses an internal transformer to work on the proper voltage. If wires or the box isn’t tight enough, you may hear a low humming noise in the furnace when off. Your furnace also has a blower motor, which sends heated or cooled air around your space, and a capacitor, which turns on the motor. If either of these parts are fading, they will buzz when the furnace starts.

3. Furnace Making a Rattling Noise

If your furnace is making a rattling noise, it can be the result of something minor, like an unsecure screw, or something critical, like a broken part. In either case, we recommend shutting off your furnace and getting in touch with our heating pros at 972-445-9504 for assistance.

4. Furnace Making a Squealing Noise

If your furnace makes a high-pitched noise, like squealing, when it’s going, it’s trying to get your attention it requires some TLC. If you’ve forgotten furnace maintenance the last couple of years, belts could be worn down or a bearing may need to be lubricated. We realize that maintenance sometimes slips your mind, but our pros 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 likely due to an air leak in your ductwork. You could also hear whistling while the furnace is running if a floor vent isn’t secure. If you’ve examined your vents but are still hearing whistling, Mustang Mechanical can assist you. It’s essential to get loose ductwork repaired without delay, as it can result in comfort issues in your house and increase your utility expenses.

6. Furnace Making a Grinding Noise

It’s not a good sign if you detect your furnace making a grinding noise. This metal-on-metal racket often means there’s an issue with your furnace’s blower. Shut down your furnace off immediately and reach our pros at 972-445-9504 for help.

When you’re getting a weird noise from your furnace, Mustang Mechanical is here to provide assistance. Contact us at 972-445-9504 to request your furnace repair appointment now.

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