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

October 13, 2020

When your furnace is running correctly, it should deliver heat without creating too much disruption. While it’s common to hear your furnace making noise as it starts up, other noises are signaling your furnace requires immediate professional help.

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

1. Furnace Making a Banging Noise

You might have an urgent situation 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 couple of problems. These involve gas building up in your furnace or a ductwork issue.

Banging Sounds Coming from Your Furnace

Your heating system gets grimy over time, so that’s why it’s important to schedule routine furnace maintenance with Lanz Furnace and Fireplace. One of the jobs our technicians do during this work is clean your furnace’s burners. When this part gets dirty, you could hear your furnace making a loud rumbling noise if ignition is delayed. The ensuing gas buildup might crack your furnace’s heat exchanger, where natural gas turns into warm air. Any cracks in it can leak carbon monoxide, which is ordinarily emitted away from your home. This toxic gas can be lethal in large concentrations.

If you’re aware of banging or knocking sounds coming from your furnace, Lanz Furnace and Fireplace recommends turning it off and reaching us at 608-291-3606. Significant natural gas in your furnace or a ruptured heat exchanger are serious issues that necessitate fast service.

Banging Sounds Coming from Your Ductwork

Your furnace works with ductwork to deliver warm air throughout your home. If the ductwork wasn’t put in properly or is getting dated, it can make a lot of noise when your furnace is heating. This could be the case if your furnace makes a banging noise when it shuts off. Get in touch with Lanz Furnace and Fireplace at 608-291-3606 and we’ll determine the problem.

2. Furnace Making a Buzzing Noise

If you hear your furnace making a buzzing noise, don’t hesitate to call us. A buzzing sound often means there’s an electrical problem, like with its transformer, blower motor or capacitor.

Your furnace depends on an internal transformer to operate on the proper 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 works with a blower motor, which distributes hot or cold air throughout your rooms, and a capacitor, which starts the motor. If either of these components are failing, they will buzz when the furnace switches on.

3. Furnace Making a Rattling Noise

If your furnace is making a rattling noise, it could be related to something minor, like an unfastened screw, or something critical, like a broken piece. In either case, we advise shutting your furnace off and contacting our heating professionals at 608-291-3606 for assistance.

4. Furnace Making a Squealing Noise

If your furnace makes a high-pitched noise, like squealing, when it’s going, it’s attempting to tell you it could use some TLC. If you’ve skipped furnace maintenance the past few years, belts could be worn down or a bearing could need to be greased. We realize that maintenance sometimes slips your mind, but our professionals can get your furnace heating quietly again quickly.

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 notice whistling while the furnace is operating if a floor vent isn’t tight. If you’ve checked your vents but are still noticing noise, Lanz Furnace and Fireplace can assist you. It’s important to get loose ductwork fixed fast, since it can create comfort troubles in your house and drive up your heating expenses.

6. Furnace Making a Grinding Noise

It’s not a good sign if you notice your furnace making a grinding noise. This metal-on-metal sound frequently means there’s a problem with your furnace’s blower. Turn off your furnace off right away and reach our pros at 608-291-3606 for assistance.

When you’re hearing a strange noise from your furnace, Lanz Furnace and Fireplace is here to help. Contact us at 608-291-3606 to request your furnace repair appointment right away.