Banging, Screeching and Rattling: What 6 Typical Furnace Noises Signify

October 13, 2020

When your furnace is working properly, it should deliver warm air without generating too much sound. While it’s common to notice your furnace making noise as it begins running, other sounds are showing your furnace requires immediate professional help.

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

1. Furnace Making a Banging Noise

You may have a serious situation on your hands if you’re hearing your furnace making a banging noise. If your furnace is making a knocking noise, it may mean there could be a couple of problems. These range from gas accumulating in your furnace or a ductwork problem.

Banging Sounds Coming from Your Furnace

Your heating system gets grimy as time passes, so that’s why it’s important to set annual furnace maintenance with WM J Kraus & Son. One of the things our professionals perform during this appointment is clean your furnace’s burners. When this piece gets grimy, you could hear your furnace making a loud rumbling noise if ignition takes longer than normal. The subsequent gas buildup can crack your furnace’s heat exchanger, where natural gas turns into warm air. Any fractures in it can discharge carbon monoxide, which is ordinarily vented outdoors. This dangerous gas can be fatal in large concentrations.

If you’re aware of banging or knocking sounds coming from your furnace, WM J Kraus & Son advises turning it off and contacting us at 319-229-2318. Excessive natural gas in your furnace or a broken heat exchanger are critical issues that require fast service.

Banging Sounds Coming from Your Ductwork

Your furnace works with ductwork to provide warm air throughout your house. If the ductwork wasn’t put in properly or is getting dated, it can make a lot of noise when your furnace runs. This might be the case if your furnace makes a banging noise when it shuts off. Get in touch with WM J Kraus & Son at 319-229-2318 and we’ll determine the problem.

2. Furnace Making a Buzzing Noise

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

Your furnace uses an internal transformer to operate on the proper voltage. If wires or the box isn’t tight enough, you might detect a low humming noise in the furnace when off. Your furnace also uses a blower motor, which sends hot or cold air around your rooms, and a capacitor, which starts 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 can be due to something little, like an unfastened screw, or something serious, like a broken piece. In either case, we urge you to shut your furnace off and getting in touch with our heating pros at 319-229-2318 for support.

4. Furnace Making a Squealing Noise

If your furnace makes a high-pitched noise, like squealing, when it’s running, it’s making an effort to tell you it could use some TLC. If you’ve forgotten furnace maintenance the last couple of years, belts could be dilapidated or a bearing may need to be greased. We realize that maintenance often slips your mind, but our pros can get your furnace operating quietly again quickly.

5. Furnace Making a Whistling Noise

When you’re noticing your furnace making a whistling noise, it’s frequently because of an air leak in your ductwork. You could also be aware of whistling while the furnace is operating if a floor vent is loose. If you’ve checked your vents but are still hearing noise, WM J Kraus & Son can help. It’s essential to get loose ductwork repaired quickly, as it can create comfort troubles in your home and drive up your energy bills.

6. Furnace Making a Grinding Noise

It’s not an encouraging sign if you hear your furnace making a grinding noise. This metal-on-metal noise typically means there’s an issue with your furnace’s blower. Shut down your furnace off instantly and reach our pros at 319-229-2318 for support.

When you’re hearing a strange noise from your furnace, WM J Kraus & Son is available to help. Contact us at 319-229-2318 to schedule your furnace repair appointment right away.