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

October 13, 2020

When your furnace is running properly, it should give heat without creating too much noise. While it’s common to catch your furnace making noise as it turns on, other noises are indicating your furnace requires immediate professional assistance.

Here are some of the most common furnace noises and what they might mean. If your furnace is making an odd noise, our friendly heating professionals are here to fix the problem with the best furnace repair in Plover.

1. Furnace Making a Banging Noise

You could have a critical problem 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 a few problems. These involve gas increasing in your furnace or a ductwork issue.

Banging Sounds Coming from Your Furnace

Your heating system becomes dirty over time, so that’s why it’s important to schedule seasonal furnace maintenance with Point Heating & Cooling. One of the tasks our pros do during this work is clean your furnace’s burners. When this piece gets grubby, you may hear your furnace making a loud rumbling noise when ignition takes more time. The resulting gas buildup may break your furnace’s heat exchanger, where natural gas transforms into warmth. Any fractures in it can emit carbon monoxide, which is normally released outside. This dangerous gas can be lethal in large concentrations.

If you’re aware of banging or knocking sounds coming from your furnace, Point Heating & Cooling urges you to turn it off and reaching us at 715-504-0533. Excessive natural gas in your furnace or a cracked heat exchanger are dangerous troubles that should get prompt attention.

Banging Sounds Coming from Your Ductwork

Your furnace works with ductwork to move warm air around your house. If the ductwork wasn’t installed correctly or is getting old, it can be noisy when your furnace runs. This might be the issue if your furnace makes a banging noise when it shuts off. Call Point Heating & Cooling at 715-504-0533 and we’ll pinpoint the problem.

2. Furnace Making a Buzzing Noise

If you observe your furnace making a buzzing noise, don’t delay calling us. A buzzing sound often indicates an electrical situation, 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 could detect a low humming noise in the furnace when off. Your furnace also works with a blower motor, which sends hot or cold air across your home, and a capacitor, which starts the motor. If either of these parts are going out, they will buzz when the furnace turns on.

3. Furnace Making a Rattling Noise

If your furnace is making a rattling noise, it can be due to something little, like an unsecure screw, or something major, like a broken piece. In either case, we recommend shutting off your furnace and calling our heating pros at 715-504-0533 for support.

4. Furnace Making a Squealing Noise

If your furnace makes a high-pitched noise, like squealing, when it’s going, it’s making an effort to tell you it needs some TLC. If you’ve forgotten furnace maintenance recently, belts could be dilapidated or a bearing may need to be lubed. We are aware that maintenance sometimes slips your mind, but our techs can get your furnace heating quietly again fast.

5. Furnace Making a Whistling Noise

When you’re hearing your furnace making a whistling noise, it’s likely the result of an air leak in your ductwork. You might also hear whistling while the furnace is operating if a floor vent isn’t secure. If you’ve looked at your vents but are still noticing sound, Point Heating & Cooling can provide support. It’s critical to get loose ductwork repaired quickly, as it can make comfort problems in your home and inflate your gas bills.

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 typically means there’s trouble with your furnace’s blower. Turn off your furnace off instantly and reach our professionals at 715-504-0533 for assistance.

When you’re getting a weird noise from your furnace, Point Heating & Cooling is here to provide assistance. Contact us at 715-504-0533 to book your furnace repair appointment today.