When your furnace is working correctly, it should give heat without creating too much sound. While it’s expected to hear your furnace making noise as it starts up, other disruptions are indicating your furnace needs immediate professional help.

Here are some of the most frequent furnace noises and what they might be indicating. If your furnace is making a strange noise, our friendly heating pros are here to help with the best furnace repair in Smyrna, Delaware.

1. Furnace Making a Banging Noise

You may have a serious problem on your hands if you’re detecting your furnace making a banging noise. If your furnace is making a knocking noise, it might indicate there could be a few problems. These involve gas building up in your furnace or a ductwork issue.

Banging Sounds Coming from Your Furnace

Your heating system becomes dirty over time, so that’s why it’s important to book seasonal furnace maintenance with Fletcher Plumbing, Heating & AC. One of the tasks our techs do during this service is clean your furnace’s burners. When this part gets grimy, you could hear your furnace making a loud rumbling noise if ignition is delayed. The ensuing gas buildup can fracture your furnace’s heat exchanger, where natural gas turns into heat. Any cracks in it can emit carbon monoxide, which is regularly emitted away from your home. This dangerous gas can be fatal in large concentrations.

If you’re noticing banging or knocking sounds coming from your furnace, Fletcher Plumbing, Heating & AC urges you to turn it off and reaching us at 302-653-0503. Too much natural gas in your furnace or a cracked heat exchanger are serious problems that necessitate prompt repairs.

Banging Sounds Coming from Your Ductwork

Your furnace uses ductwork to provide heated air across your house. If the ductwork wasn’t installed correctly or is getting dated, it can be loud when your furnace runs. This can be the problem if your furnace makes a banging noise when it shuts off. Contact Fletcher Plumbing, Heating & AC at 302-653-0503 and we’ll determine 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 usually means there’s an electrical situation, like with its transformer, blower motor or capacitor.

Your furnace relies on an internal transformer to work on the correct voltage. If wires or the box needs to be tightened, you could detect a low humming noise in the furnace when off. Your furnace also works with a blower motor, which sends hot or chilly air around your residence, and a capacitor, which starts the motor. If either of these pieces are going out, they will buzz when the furnace starts.

3. Furnace Makes Rattling Sounds Like Something Is Loose

If your furnace is making a rattling noise, it could be due to something minor, like a loose screw, or something serious, like a broken piece. In either case, we urge you to shut your furnace off and calling our heating specialists at 302-653-0503 for assistance.

4. Furnace Is Making a High-Pitched Squealing Sound

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 skipped furnace maintenance recently, belts could be worn down or a bearing may need to be lubed. We realize that maintenance often slips your mind, but our professionals can get your furnace heating quietly again quickly.

5. Furnace Whistles

When you’re hearing your furnace making a whistling noise, it’s likely the result of an air leak in your ductwork. You could also hear whistling while the furnace is running if a floor vent isn’t tight. If you’ve examined your vents but are still hearing sound, Fletcher Plumbing, Heating & AC can assist you. It’s essential to get loose ductwork taken care of fast, since it can create comfort issues in your house and inflate your heating costs.

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 sound frequently means there’s a problem with your furnace’s blower. Shut down your furnace off right away and contact our professionals at 302-653-0503 for support.

When you’re getting an uncommon noise from your furnace, Fletcher Plumbing, Heating & AC is available to support you. Contact us at 302-653-0503 to request your furnace repair appointment right away.