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

October 13, 2020

When your furnace is running properly, it should give heat without creating too much noise. While it’s expected to notice your furnace making noise as it begins running, other noises are signaling your furnace should get immediate professional assistance.

Here are some of the most frequent furnace noises and what they can be signaling. If your furnace is making a strange noise, our friendly heating pros are here to assist with the best furnace repair in the Rio Grande Valley.

1. Furnace Making a Banging Noise

You may have a critical problem on your hands if you’re noticing 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 situation.

Banging Sounds Coming from Your Furnace

Your heating system gets dirty as time passes, so that’s why it’s important to book annual furnace maintenance with Cytech Heating & Cooling L.C.. One of the tasks our pros complete during this work is clean your furnace’s burners. When this part gets dirty, you could hear your furnace making a loud rumbling noise when ignition is delayed. The ensuing gas buildup might crack your furnace’s heat exchanger, where natural gas turns into heat. Any fractures in it can emit carbon monoxide, which is ordinarily vented away from your home. This dangerous gas can be deadly in large concentrations.

If you’re aware of banging or knocking sounds coming from your furnace, Cytech Heating & Cooling L.C. recommends turning it off and contacting us at 956-630-3522. Significant natural gas in your furnace or a ruptured heat exchanger are serious issues that require immediate repairs.

Banging Sounds Coming from Your Ductwork

Your furnace uses ductwork to move heated air around your home. If the ductwork wasn’t put in correctly or is getting old, it can be loud when your furnace is on. This could be the problem if your furnace makes a banging noise when it shuts off. Contact Cytech Heating & Cooling L.C. at 956-630-3522 and we’ll figure out 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 frequently means there’s an electrical situation, like with its transformer, blower motor or capacitor.

Your furnace depends on an internal transformer to operate on the proper voltage. If wires or the box is loose, you could detect a low humming noise in the furnace when off. Your furnace also works with a blower motor, which moves hot or cold air across your residence, and a capacitor, which triggers the motor. If either of these components are going out, they will buzz when the furnace turns on.

3. Furnace Making a Rattling Noise

If your furnace is making a rattling noise, it might be the result of something small, like a loose screw, or something serious, like a broken component. In either case, we advise shutting your furnace off and contacting our heating pros at 956-630-3522 for assistance.

4. Furnace Making a Squealing Noise

If your furnace makes a high-pitched noise, like squealing, when it’s going, it’s attempting to alert you it needs some TLC. If you’ve skipped furnace maintenance the past few years, belts could be worn down or a bearing may need to be greased. We know that maintenance sometimes slips your mind, but our technicians can get your furnace heating quietly again quickly.

5. Furnace Making a Whistling Noise

When you’re hearing your furnace making a whistling noise, it’s typically due to an air leak in your ductwork. You could also hear whistling while the furnace is operating if a floor vent isn’t tight. If you’ve examined your vents but are still noticing whistling, Cytech Heating & Cooling L.C. can help. It’s important to get loose ductwork taken care of without delay, because it can create comfort troubles in your residence and drive up your utility expenses.

6. Furnace Making a Grinding Noise

It’s not a good 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 right away and reach our pros at 956-630-3522 for help.

When you’re hearing an uncommon noise from your furnace, Cytech Heating & Cooling L.C. is ready to support you. Contact us at 956-630-3522 to schedule your furnace repair appointment right away.