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

October 13, 2020

When your furnace is working properly, it should give warm air without creating too much disruption. While it’s normal to hear your furnace making noise as it turns on, other disruptions are indicating your furnace requires immediate professional support.

Here are some of the most common furnace noises and what they could be signaling. If your furnace is making a weird noise, our friendly heating specialists are here to fix the problem with the best furnace repair in Gresham, OR.

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 may mean there could be a few problems. These range from gas accumulating in your furnace or a ductwork issue.

Banging Sounds Coming from Your Furnace

Your heating system gets grimy over time, so that’s why it’s critical to schedule yearly furnace maintenance with Honke Heating & AC. One of the things our pros perform during this appointment is clean your furnace’s burners. When this component gets dirty, you could hear your furnace making a loud rumbling noise after ignition is delayed. The resulting gas buildup may fracture your furnace’s heat exchanger, where natural gas changes into warm air. Any breaks 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 hearing banging or knocking sounds coming from your furnace, Honke Heating & AC urges you to turn it off and calling us at 503-663-8033. Excessive natural gas in your furnace or a ruptured heat exchanger are critical problems that require prompt repairs.

Banging Sounds Coming from Your Ductwork

Your furnace works with ductwork to move heated air throughout your home. If the ductwork wasn’t put in properly or is getting old, it can make a lot of noise when your furnace is on. This could be the case if your furnace makes a banging noise when it shuts off. Call Honke Heating & AC at 503-663-8033 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 frequently indicates 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 needs to be tightened, you could detect a low humming noise in the furnace when off. Your furnace also uses a blower motor, which distributes hot or cold air throughout your house, and a capacitor, which turns on the motor. If either of these parts 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 could be related to something small, like an unfastened screw, or something major, like a broken component. In either case, we recommend shutting off your furnace and calling our heating professionals at 503-663-8033 for assistance.

4. Furnace Making a Squealing Noise

If your furnace makes a high-pitched noise, like squealing, when it’s heating, it’s making an effort to tell you it could use some TLC. If you’ve neglected furnace maintenance the past few years, belts could be worn down or a bearing could need to be lubricated. We know that maintenance sometimes slips your mind, but our pros can get your furnace heating quietly again quickly.

5. Furnace Making a Whistling Noise

When you’re noticing your furnace making a whistling noise, it’s typically the result of an air leak in your ductwork. You could also be aware of whistling while the furnace is on if a floor vent isn’t secure. If you’ve looked at your vents but are still hearing noise, Honke Heating & AC can provide support. It’s critical to get loose ductwork repaired quickly, as it can result in comfort problems in your residence and increase your energy 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 typically means there’s an issue with your furnace’s blower. Shut down your furnace off immediately and call our professionals at 503-663-8033 for help.

When you’re noticing an atypical noise from your furnace, Honke Heating & AC is available to support you. Contact us at 503-663-8033 to book your furnace repair appointment now.