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

October 13, 2020

When your furnace is operating properly, it should provide heat without generating too much disruption. While it’s expected to hear your furnace making noise as it starts up, other noises are showing your furnace should get immediate professional help.

Here are some of the most common furnace noises and what they might be signaling. If your furnace is making a strange noise, our friendly heating professionals are here to assist with the best furnace repair in Magnolia, TX.

1. Furnace Making a Banging Noise

You might have a serious situation on your hands if you’re hearing your furnace making a banging noise. If your furnace is making a knocking noise, it may mean 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 time, so that’s why it’s essential to set seasonal furnace maintenance with JTech Mechanical. One of the tasks our professionals perform during this work is clean your furnace’s burners. When this piece gets grimy, you might hear your furnace making a loud rumbling noise if ignition takes longer than normal. The resulting gas buildup may break your furnace’s heat exchanger, where natural gas changes into heat. Any fractures in it can discharge carbon monoxide, which is regularly emitted outside. This hazardous gas can be lethal in large concentrations.

If you’re aware of banging or knocking sounds coming from your furnace, JTech Mechanical urges you to turn it off and reaching us at 281-231-8768. Too much natural gas in your furnace or a fractured heat exchanger are dangerous problems that necessitate fast attention.

Banging Sounds Coming from Your Ductwork

Your furnace works with ductwork to move hot air throughout your residence. If the ductwork wasn’t put in correctly or is getting old, it can make a lot of noise when your furnace is heating. This can be the problem if your furnace makes a banging noise when it shuts off. Get in touch with JTech Mechanical at 281-231-8768 and we’ll pinpoint the problem.

2. Furnace Making a Buzzing Noise

If you hear your furnace making a buzzing noise, don’t wait 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 run on the proper voltage. If wires or the box needs to be tightened, you could detect a low humming noise in the furnace when off. Your furnace also has a blower motor, which distributes warm or cold air across 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 can be related to something little, like an unfastened screw, or something major, like a broken component. In either case, we urge you to shut your furnace off and getting in touch with our heating professionals at 281-231-8768 for support.

4. Furnace Making a Squealing Noise

If your furnace makes a high-pitched noise, like squealing, when it’s heating, it’s trying to tell you it needs some TLC. If you’ve skipped furnace maintenance recently, belts could be worn out or a bearing may need to be greased. We are aware that maintenance often slips your mind, but our pros can get your furnace operating quietly again fast.

5. Furnace Making a Whistling Noise

When you’re hearing your furnace making a whistling noise, it’s typically because 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 checked your vents but are still noticing sound, JTech Mechanical can help. It’s critical to get loose ductwork fixed fast, as it can result in comfort troubles in your house and drive up your energy costs.

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 noise typically means there’s an issue with your furnace’s blower. Turn off your furnace off promptly and reach us at 281-231-8768 for support.

When you’re noticing a strange noise from your furnace, JTech Mechanical is ready to provide assistance. Contact us at 281-231-8768 to schedule your furnace repair appointment right away.