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

October 13, 2020

When your furnace is working correctly, it should provide heat without creating too much noise. While it’s expected to catch your furnace making noise as it begins running, other disruptions are showing your furnace should get immediate professional support.

Here are some of the most frequent furnace noises and what they could be indicating. If your furnace is making an odd noise, our friendly heating specialists are here to help with the best furnace repair in Sacramento, CA.

1. Furnace Making a Banging Noise

You might 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 a few problems. These include gas building up in your furnace or a ductwork issue.

Banging Sounds Coming from Your Furnace

Your heating system becomes filthy as time passes, so that’s why it’s critical to schedule seasonal furnace maintenance with American HVAC Inc. One of the jobs our technicians perform during this service is clean your furnace’s burners. When this component gets grimy, you may hear your furnace making a loud rumbling noise if ignition takes more time. The resulting gas buildup can break your furnace’s heat exchanger, where natural gas changes into warmth. Any cracks in it can leak carbon monoxide, which is regularly released outside. This hazardous gas can be lethal in large concentrations.

If you’re hearing banging or knocking sounds coming from your furnace, American HVAC Inc advises turning it off and calling us at 916-243-6714. Excessive natural gas in your furnace or a fractured heat exchanger are serious issues that require prompt repairs.

Banging Sounds Coming from Your Ductwork

Your furnace uses ductwork to move warm air around your house. If the ductwork wasn’t designed properly or is getting dated, it can be loud when your furnace is heating. This could be the case if your furnace makes a banging noise when it shuts off. Contact American HVAC Inc at 916-243-6714 and we’ll determine the problem.

2. Furnace Making a Buzzing Noise

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

Your furnace relies on an internal transformer to run on the right voltage. If wires or the box is loose, you might detect a low humming noise in the furnace when off. Your furnace also uses a blower motor, which moves warm or chilly air throughout your home, and a capacitor, which starts the motor. If either of these components 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 might be due to something minor, like an unsecure screw, or something serious, like a broken component. In either case, we urge you to shut your furnace off and calling our heating professionals at 916-243-6714 for support.

4. Furnace Making a Squealing Noise

If your furnace makes a high-pitched noise, like squealing, when it’s running, it’s trying to tell you it requires some TLC. If you’ve skipped furnace maintenance the past few years, belts could be dilapidated or a bearing could need to be lubed. We realize that maintenance sometimes slips your mind, but our professionals can get your furnace heating quietly again rapidly.

5. Furnace Making a Whistling Noise

When you’re detecting your furnace making a whistling noise, it’s frequently due to an air leak in your ductwork. You may also be aware of whistling while the furnace is running if a floor vent isn’t secure. If you’ve looked at your vents but are still noticing sound, American HVAC Inc can assist you. It’s essential to get loose ductwork repaired quickly, as it can create comfort issues in your residence and increase your heating expenses.

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 racket frequently means there’s trouble with your furnace’s blower. Switch off your furnace off promptly and call our professionals at 916-243-6714 for help.

When you’re getting an uncommon noise from your furnace, American HVAC Inc is ready to provide assistance. Contact us at 916-243-6714 to schedule your furnace repair appointment now.