When your furnace is working like it should, it should provide heat without creating too much sound. While it’s normal to catch your furnace making noise as it begins running, other sounds are showing your furnace should get immediate professional help.

Here are some of the most frequent furnace noises and what they can be signaling. If your furnace is making a weird noise, our friendly heating specialists are here to assist with the best furnace repair in Ballwin and St. Charles, Missouri.

1. Furnace Makes Banging or Knocking Sounds

You might have a critical problem on your hands if you’re detecting your furnace making a banging noise. If your furnace is making a knocking noise, it might mean 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 becomes grimy as time passes, so that’s why it’s important to set yearly furnace maintenance with Air Alliance Team. One of the jobs our techs complete during this service is clean your furnace’s burners. When this piece gets grimy, you might hear your furnace making a loud rumbling noise after ignition takes more time. The ensuing gas buildup might crack your furnace’s heat exchanger, where natural gas turns into warm air. Any fractures in it can emit carbon monoxide, which is normally emitted outdoors. This toxic gas can be lethal in large concentrations.

If you’re aware of banging or knocking sounds coming from your furnace, Air Alliance Team urges you to turn it off and calling us at 636-206-4584. Significant natural gas in your furnace or a fractured heat exchanger are dangerous problems that require immediate repairs.

Banging Sounds Coming from Your Ductwork

Your furnace relies on ductwork to provide hot air throughout your residence. If the ductwork wasn’t designed correctly or is aging, it can be noisy when your furnace runs. This might be the problem if your furnace makes a banging noise when it shuts off. Contact Air Alliance Team at 636-206-4584 and we’ll pinpoint the problem.

2. Furnace Buzzes Constantly

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 run on the right voltage. If wires or the box is loose, you may detect a low humming noise in the furnace when off. Your furnace also has a blower motor, which distributes hot or cooled air across your house, and a capacitor, which triggers the motor. If either of these parts are going out, they will buzz when the furnace switches on.

3. Furnace Making a Rattling Noise

If your furnace is making a rattling noise, it may be related to something little, like a loose screw, or something serious, like a broken component. In either case, we recommend shutting off your furnace and calling our heating pros at 636-206-4584 for assistance.

4. Furnace Making a Squealing Noise

If your furnace makes a high-pitched noise, like squealing, when it’s on, it’s trying to alert you it could use some TLC. If you’ve forgotten furnace maintenance recently, belts could be worn out or a bearing might need to be greased. We realize that maintenance often slips your mind, but our techs can get your furnace operating quietly again rapidly.

5. Furnace Makes a Whistling Sound Like Air Escaping

When you’re hearing your furnace making a whistling noise, it’s typically the result of an air leak in your ductwork. You might also hear whistling while the furnace is on if a floor vent is loose. If you’ve looked at your vents but are still sensing sound, Air Alliance Team can assist you. It’s critical to get loose ductwork taken care of without delay, since it can result in comfort problems in your house and inflate your gas expenses.

6. Furnace Makes Noise that Sounds Like Scraping Metal

It’s not an encouraging sign if you detect your furnace making a grinding noise. This metal-on-metal sound frequently means there’s an issue with your furnace’s blower. Shut down your furnace off now and call our professionals at 636-206-4584 for support.

When you’re hearing a strange noise from your furnace, Air Alliance Team is available to support you. Contact us at 636-206-4584 to request your furnace repair appointment right away.