24/7 Emergency Support

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

October 13, 2020

When your furnace is running properly, it should provide warmth without making too much disruption. While it’s normal to catch your furnace making noise as it starts up, other disruptions are signaling your furnace should get immediate professional assistance.

Here are some of the most common furnace noises and what they might mean. If your furnace is making a strange noise, our friendly heating pros are here to help with the best furnace repair in Carpentersville, IL.

1. Furnace Making a Banging Noise

You could have a serious issue on your hands if you’re noticing your furnace making a banging noise. If your furnace is making a knocking noise, it might indicate there could be a couple of problems. These range from gas increasing in your furnace or a ductwork situation.

Banging Sounds Coming from Your Furnace

Your heating system turns dirty over the years, so that’s why it’s important to schedule annual furnace maintenance with Controlled Comfort HVAC Inc. One of the things our professionals do 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 is delayed. The resulting gas buildup might crack your furnace’s heat exchanger, where natural gas transforms into warmth. Any fractures in it can leak carbon monoxide, which is normally released outside. This hazardous gas can be fatal in large concentrations.

If you’re hearing banging or knocking sounds coming from your furnace, Controlled Comfort HVAC Inc recommends turning it off and calling us at 224-412-8308. Too much natural gas in your furnace or a ruptured heat exchanger are dangerous troubles that necessitate immediate attention.

Banging Sounds Coming from Your Ductwork

Your furnace uses ductwork to move hot air throughout your residence. If the ductwork wasn’t installed right or is getting dated, it can be loud when your furnace is on. This could be the issue if your furnace makes a banging noise when it shuts off. Contact Controlled Comfort HVAC Inc at 224-412-8308 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 typically indicates an electrical issue, like with its transformer, blower motor or capacitor.

Your furnace uses an internal transformer to run on the proper voltage. If wires or the box needs to be tightened, you could hear a low humming noise in the furnace when off. Your furnace also has a blower motor, which moves warm or cooled air throughout your house, and a capacitor, which turns on the motor. If either of these parts 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 due to something minor, like a loose screw, or something serious, like a broken piece. In either case, we recommend shutting off your furnace and getting in touch with our heating specialists at 224-412-8308 for assistance.

4. Furnace Making a Squealing Noise

If your furnace makes a high-pitched noise, like squealing, when it’s on, it’s attempting to tell you it could use some TLC. If you’ve skipped furnace maintenance the last couple of years, belts could be worn out or a bearing could need to be lubed. We realize that maintenance frequently 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 typically because of an air leak in your ductwork. You could also be aware of whistling while the furnace is operating if a floor vent isn’t secure. If you’ve checked your vents but are still hearing whistling, Controlled Comfort HVAC Inc can provide support. It’s important to get loose ductwork taken care of without delay, because it can make comfort problems in your residence and drive up your gas costs.

6. Furnace Making a Grinding Noise

It’s not an encouraging sign if you detect your furnace making a grinding noise. This metal-on-metal noise usually means there’s a problem with your furnace’s blower. Shut down your furnace off right away and reach us at 224-412-8308 for support.

When you’re noticing a strange noise from your furnace, Controlled Comfort HVAC Inc is ready to provide assistance. Contact us at 224-412-8308 to book your furnace repair appointment now.