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

October 13, 2020

When your furnace is working properly, it should deliver warm air without generating too much disruption. While it’s normal to hear your furnace making noise as it turns on, other sounds are indicating 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 an atypical noise, our friendly heating professionals are here to assist with the best furnace repair in Lafayette, LA.

1. Furnace Making a Banging Noise

You may have a critical situation on your hands if you’re detecting 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 increasing in your furnace or a ductwork situation.

Banging Sounds Coming from Your Furnace

Your heating system gets filthy as time passes, so that’s why it’s critical to set annual furnace maintenance with AC Sales. One of the tasks our technicians perform during this service is clean your furnace’s burners. When this component gets dirty, you may hear your furnace making a loud rumbling noise when ignition is delayed. The ensuing gas buildup may break your furnace’s heat exchanger, where natural gas changes into warmth. Any cracks in it can leak carbon monoxide, which is regularly emitted outside. This dangerous gas can be deadly in large concentrations.

If you’re hearing banging or knocking sounds coming from your furnace, AC Sales urges you to turn it off and calling us at (337) 234-2345. Significant natural gas in your furnace or a ruptured heat exchanger are dangerous problems that necessitate prompt attention.

Banging Sounds Coming from Your Ductwork

Your furnace relies on ductwork to move warm air throughout your house. If the ductwork wasn’t designed correctly or is getting dated, it can be loud when your furnace is on. This can be the problem if your furnace makes a banging noise when it shuts off. Get in touch with AC Sales at (337) 234-2345 and we’ll figure out the problem.

2. Furnace Making a Buzzing Noise

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

Your furnace uses an internal transformer to operate on the correct voltage. If wires or the box is loose, you may notice a low humming noise in the furnace when off. Your furnace also has a blower motor, which sends heated or cold air around your house, and a capacitor, which starts the motor. If either of these components are going out, they will buzz when the furnace starts.

3. Furnace Making a Rattling Noise

If your furnace is making a rattling noise, it may be the result of something minor, like an unsecure screw, or something major, like a broken part. In either case, we recommend shutting off your furnace and contacting our heating professionals at (337) 234-2345 for assistance.

4. Furnace Making a Squealing Noise

If your furnace makes a high-pitched noise, like squealing, when it’s heating, it’s attempting to alert you it could use some TLC. If you’ve neglected furnace maintenance the last couple of years, belts could be dilapidated or a bearing could need to be lubed. We realize that maintenance often slips your mind, but our professionals can get your furnace operating quietly again rapidly.

5. Furnace Making a Whistling Noise

When you’re noticing your furnace making a whistling noise, it’s typically the result of an air leak in your ductwork. You could also be aware of whistling while the furnace is running if a floor vent is loose. If you’ve examined your vents but are still noticing sound, AC Sales can assist you. It’s essential to get loose ductwork taken care of quickly, since it can create comfort troubles in your residence and increase your utility expenses.

6. Furnace Making a Grinding Noise

It’s not a positive sign if you hear 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 promptly and call our professionals at (337) 234-2345 for assistance.

When you’re hearing an atypical noise from your furnace, AC Sales is here to provide assistance. Contact us at (337) 234-2345 to schedule your furnace repair appointment now.