The Reasons Behind Your Furnace's Noise

When they work, the majority of mechanical devices produce some noise. Furnaces are not an exception, but they should not produce excessive noise when operating properly.

If strange, loud noises start coming from your furnace, there’s probably a problem and it might need to be fixed. Having said that, these are some typical furnace noises along with their most likely causes.

1. Noises Of Scraping

Making scraping sounds could be a sign that something is wrong with your blower wheel. The sound of scraping can be quite unsettling as it looks like metal rubbing against metal.

There are several reasons why your blower wheel could be scraping the ground. First, it might need to be replaced if it is broken. It might have come loose as well, pounding against the blower casing and making a scraping sound.

If your furnace starts to make a scraping noise, turn it off right away and schedule an inspection with a technician. If you ignore a scraping sound, it may indicate a major problem with your blower wheel and cause significant wear and tear on your system.

2. The Noises Of Squealing And Screaming

The cause of squealing and screeching noises is typically a blower motor problem. The bearings in the motor are prone to drying out over time. Adding lubricant is usually the solution to motor bearing problems. If you decide to lubricate the device yourself, make sure you use the right kind of lubricant—either mineral or synthetic.

There may also be squealing and screeching noises from a broken belt. To avoid your furnace malfunctioning, get in touch with a qualified furnace technician at for assistance with belt replacement.

3. Noises Of Whistling

Similar to screeching or squealing noises, whistling is brought on by problems with the blower motor. There is a chance that the blower will experience low airflow. Whistling may come from the blower straining to pull in enough air to heat due to low airflow. If you hear a high-pitched whistling sound coming from your furnace, you should try cleaning your air filter or opening all of the vents. For additional help, speak with a furnace technician if these fixes don’t work.

4. Noises Of Popping And Banging

Sounds like popping and banging are common. Furnaces frequently produce these noises when the ducts contract and expand. On the other hand, if the popping and banging noises are very loud and frequent, there may be a furnace issue. Loud pops and bangs are frequently caused by ductwork problems. Another source of these noises is dirty burners that take longer to ignite. Don’t ignore the issue if your furnace starts to make loud popping and banging noises. It might break the heat exchanger, compromising your safety and necessitating expensive repairs.

5. Noises Of Rattling

The most likely cause of a rattling noise coming from the furnace is a loose panel or door. To fix the issue, check to see if the panels and doors outside your furnace are securely fastened. If not, tighten any loose screws.

If that doesn’t fix the issue, there might be a loose component. Furnaces are complex mechanical machines with moving parts all the time. Over time, these components may come loose, particularly if they weren’t tightened correctly. After turning off your furnace, get assistance from a professional to tighten any loose parts.

Parts, doors, and loose panels are frequently the primary source of rattling. Rattling, on the other hand, may indicate a serious fracture in your heat exchanger. It is dangerous when carbon monoxide leaks into your home from a broken heat exchanger. In case carbon monoxide poisoning is not prevented by the rattling sound, get in touch with a furnace technician right away.

6. Noises Of Rumbling

Your furnace may make a small roaring or whooshing sound after a cycle is finished. However, it might be problematic if it makes a loud rumbling sound. After a cycle, a loud rumbling sound could mean there’s a problem with the burner. When fuel burns in the combustion chamber after the burners are turned off, it frequently produces a rumbling sound.

One shouldn’t ignore a rumbling noise. To reduce the chance of carbon monoxide poisoning, contact a furnace contractor right away if your furnace begins to rumble.

7. Noises Of Buzzing And Humming

There’s no need to be alarmed if your furnace is making a low humming noise. When operating, many furnaces make a dull humming sound. However, there might be a problem with the motor if your furnace makes a loud buzzing or humming noise. It might also mean that there’s a problem with the fan itself. If your furnace continuously produces loud buzzing or humming noises, get in touch with a contractor to check the electrical parts.

8. Noises Of Thwapping

Thwapping is not as startling or annoying as many of the noises that have been discussed thus far. It usually occurs when something gets in the way of the blower blades or touches the blower from inside the unit. It sounds like a card in the spokes of a bicycle tire.

Thwapping usually not causes much concern, but if the issue is not fixed, it may cause the belt or motor to wear out sooner than anticipated. The motor may have to work harder than necessary due to wear and tear, which will lower the furnace’s efficiency. To restore its efficiency and avoid future expensive repairs, have a professional inspect your furnace if it is producing a continuous thwapping sound.

9. Noises Of Clicking

Your furnace might make a clicking sound when it fires up. When it first starts up, it makes a normal clicking sound. But if the clicking continues during the heating cycle, your furnace isn’t working properly.

Recurrent clicking typically indicates an ignition system issue. Your furnace may click while the igniter tries to light if it is unable to ignite.

Not only the ignition system problems mentioned above, but problems with the compressor or control panel can also cause clicking noises. Clicking noises can also be produced by a malfunctioning fan motor.


All in all, on the off chance that you notice any of these issues with your furnace, reach out to a certified professional at After a complete investigation, our specialists will find the issue and propose the best strategy to fix it. Furnace noise can usually be eliminated with repairs, but occasionally our technicians may advise replacing the furnace.

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