When your furnace is working correctly, it should deliver heat without generating too much noise. While it’s common to notice your furnace making noise as it starts up, other noises are indicating your furnace needs immediate professional help.

Here are some of the most common furnace noises and what they could be signaling. If your furnace is making a strange noise, our friendly heating pros are here to fix the problem with the best furnace repair in Ballwin and St. Charles, Missouri.

1. Furnace Making a Banging Noise

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 can signal there could be several problems. These involve gas accumulating in your furnace or a ductwork problem.

Banging Sounds Coming from Your Furnace

Your heating system turns grimy over the years, so that’s why it’s important to schedule seasonal furnace maintenance with Air Alliance Team. One of the tasks our techs do during this work is clean your furnace’s burners. When this component gets grimy, you may hear your furnace making a loud rumbling noise if ignition takes longer than normal. The following gas buildup can break your furnace’s heat exchanger, where natural gas transforms into warm air. Any breaks in it can discharge carbon monoxide, which is regularly vented away from your home. This dangerous gas can be deadly in large concentrations.

If you’re hearing banging or knocking sounds coming from your furnace, Air Alliance Team advises turning it off and calling us at 636-206-4584. Too much natural gas in your furnace or a ruptured heat exchanger are serious troubles that necessitate fast service.

Banging Sounds Coming from Your Ductwork

Your furnace uses ductwork to provide warm air around your home. If the ductwork wasn’t installed properly or is aging, it can be noisy when your furnace is on. This could be the issue if your furnace makes a banging noise when it shuts off. Contact Air Alliance Team at 636-206-4584 and we’ll determine the problem.

2. Furnace Makes a Buzzing Sound

If you hear your furnace making a buzzing noise, don’t delay calling us. A buzzing sound frequently is telling you there’s an electrical situation, like with its transformer, blower motor or capacitor.

Your furnace uses an internal transformer to run on the correct voltage. If wires or the box is loose, you might notice a low humming noise in the furnace when off. Your furnace also has a blower motor, which sends warm or cold air around your house, and a capacitor, which turns on the motor. If either of these pieces are failing, they will buzz when the furnace switches on.

3. Furnace Makes Rattling Sounds Like Something Is Loose

If your furnace is making a rattling noise, it can be related to something little, like an unfastened screw, or something serious, like a broken part. In either case, we recommend shutting off your furnace and contacting our heating professionals at 636-206-4584 for assistance.

4. Furnace Squeals

If your furnace makes a high-pitched noise, like squealing, when it’s running, it’s trying to alert you it needs some TLC. If you’ve skipped furnace maintenance the last couple of years, belts could be worn down or a bearing may need to be lubed. We realize that maintenance often slips your mind, but our pros can get your furnace running quietly again fast.

5. Furnace Whistles

When you’re noticing your furnace making a whistling noise, it’s frequently due to an air leak in your ductwork. You might also be aware of whistling while the furnace is on if a floor vent isn’t secure. If you’ve examined your vents but are still noticing sound, Air Alliance Team can help. It’s essential to get loose ductwork fixed fast, as it can create comfort troubles in your house and drive up your heating costs.

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 noise typically means there’s a problem with your furnace’s blower. Switch off your furnace off now and contact us at 636-206-4584 for help.

When you’re hearing a strange noise from your furnace, Air Alliance Team is here to provide assistance. Contact us at 636-206-4584 to schedule your furnace repair appointment today.