Furnace Making Popping Sounds 

In this blog I will be sharing and explaining some information about the furnace making a popping noise and its causes, troubleshooting, and how can we solve the issue. I will go through the details of the noises so, let’s get started!

You’ve found yourself a few times now, standing still and listening to the noises coming from your ducting. What the hell is that ruckus? We hate to say it, but your furnace is most likely to blame.

Over time, your furnace will wear out a little and require maintenance and repair, which you should take care of as soon as possible. The various noises that these repair needs produce are one of the indications. Having said that, we all know that furnaces aren’t fully silent. We’d like to help you understand the issues by explaining what noises you might hear that indicate you should schedule furnace service in time, and how to distinguish them from normal noises.

Why is Furnace making popping sounds?

You could have filthy furnace burners or damaged air ducts if you hear popping sounds and don’t have a bag of popcorn in the microwave. When the burners are unclean, the buildup prevents them from igniting, resulting in a buildup of gas and a popping sound. This is dangerous because the explosions may crack other heating system components. 

Damaged air ducts can also generate popping or banging noises, particularly if they’re metal. When the blower is turned on and off, the ducts can expand and shrink.

The blower motor sends warm air into your house’s air ducts at the start of a heating cycle. When your furnace is turned on, you may hear a loud popping noise. This is caused by inflation in your air ducts. 

When warm air hits cold air ducts, the metal expands to meet the temperature difference. The source of the popping sounds, on the other hand, could be tainted gas burners in your furnace. As your furnace becomes older, silt will begin to accumulate on the burners. If debris is not removed from gas burners every year, a big volume of gas will collect and cause holes in your heating system.

If your furnace is making weird noises at home, you might be wondering which ones are alarming and which are simply part of normal operation. When a furnace runs, it creates some noise, but some furnace noises signal a problem with the system.

So, what are some of the noises your furnace might make that you should pay attention to? We are here to let you know. Following are types of noises that are cause for concern:

  • Popping
  • Grinding
  • Rattling
  • Screeching
  • Scraping
  • Blooming


You could have filthy furnace burners or damaged air ducts if you hear popping sounds and don’t have a bag of popcorn in the microwave. When the burners become dirty, the buildup prevents them from igniting, resulting in an overabundance of gas and a popping sound. This is risky because the explosions could cause other parts of the heating system to fracture. Air ducts that have been damaged can also generate popping or banging noises, especially if they are built of metal. When the blower is turned on and off, the ducts can expand and shrink.

The sound of a minor explosion is not to be dismissed. Another source of this noise is expanding and contracting air ducts, or filthy burners producing delayed ignition. If you hear one of these noises, you should arrange cleaner and repairs as soon as possible.

Materials NeededTools Needed
CleanerFurnace Duck Cleaning Kit


It’s a cause for concern if you hear a grinding or squealing sound, akin to what you’d hear when two pieces of metal rub together. This usually indicates a problem with the furnace’s blower wheel, and continuing to run it could result in severe damage to this critical component. The blower wheel might have come away from the motor shaft and collided with the blower casing, or the wheel’s mount could have broken off, leading the part to collide with the protective shell. Whatever is producing the noise, it’s critical to contact an HVAC specialist to see if it needs to be repaired.

Material NeededTools Needed
Furnace BlowerTool Kit For Repairing


If you hear something rattling in your heating system, it’s most likely because the ducts aren’t the right size. When the air begins to flow through the ducts, the pressure difference might cause the components to collide, resulting in the annoying rattling noise. It also implies you’re likely losing part of your heated or cooled air, therefore it’s worth having a technician look into it.

We’d like to start here because the source of this noise could be dangerous. Rattling ductwork could be one of the causes, signalling the need for duct repair. A damaged heat exchanger, on the other hand, is a major problem that could put your home at risk. Do not hesitate to contact a specialist if you hear rattling.


If your furnace sounds like it’s screaming at you, it’s time for repairs. Problems with your furnace’s blower motor are frequently the origin of screaming noises, and if left unattended for too long, they can cause major damage to your system. So, before the damage has been done you better look out for the repair of the furnace blower motor it’s time to check it out.


There is a problem with your blower fan if you hear metal scraping against metal. A blade is most likely broken or loose and will need to be repaired. This is something you can easily check with the normal tool kit you have also maybe the fan is oily and needs a little bit of cleansing to get the work done. The fan blade might be tilted and touching its frame etc. So, it’s easy to troubleshoot the prob better if you check it out by yourself.

Potentially Normal Noises

Your furnace may make some quite natural noises. You might be able to ignore the following sounds:

  • Clicking
  • Crackling
  • Whooshing 


This is a natural sound produced by your furnace as it attempts to light the gas within it to generate heat. However, if this sound persists for more than a few minutes, you should get your system evaluated by an expert.


You might hear cracking when your furnace turns off after a full warming cycle. You should be able to ignore the cracking noise as long as it does not linger for a lengthy period.


Do you hear a whoosh of air coming from your vents? Good! It would be frightening if you couldn’t hear this noise.

If you’re hearing any of the above-mentioned alarming noises, or even if you’re hearing something else, we recommend seeking help. Any loud repair needs your furnace may have can be diagnosed and addressed by us.

While some noises may appear to be frightening, they are rather common. However, some furnace noises indicate that an appointment should be scheduled as soon as possible. As a result, we’ve compiled a list of six unusual furnace noises and their meanings.

Is That a Popping, Banging, or Booming Sound Coming from Your Furnace?

When your furnace first kicks on, do you hear a slamming, booming, or popping sound? If this is the case, your furnace burner may be unclean. Dust, grime, and other organic waste can easily enter your furnace, especially if it’s located in the attic. Gas might build up as a result of this organic debris. As a result, when the flame ignites, the furnace may create a popping noise.

Metal ducting could be another source of banging, booming, or popping. When the temperature in your home changes, the metal ducting will expand and contract, which is entirely natural and nothing to be concerned about.

Is That a Scraping Sound Coming from Your Furnace?

Have you ever heard your furnace make a metal scratching sound? If this is the case, now is not the time to ignore the noise; instead, make an appointment with a professional technician right once. A scraping noise is usually caused by one of two causes, neither of which is desirable.

It could be a broken motor mount or a broken blower wheel if you hear scratching from your furnace. Your blower wheel may be tumbling all over your furnace due to a faulty motor mount. If your blower wheel is broken, it indicates it is grinding against other metal components. Both of these issues have the potential to cause serious damage to your entire system.

Have You Heard A Wheezing Sound?

Don’t be startled if you wake up alone in the middle of the night and hear a wheezing sound. It’s your furnace, after all. A wheezing or whooshing sound could signal that your air filter is full and needs to be replaced if you can’t recall the last time you changed it.

The primary purpose of the air filter is to remove dust, dander, and other particles from the treated air. Filters become clogged over time and must be updated. A wheezing sound might be heard if a filter is too full. This is simply the sound of treated air attempting to pass through the entire air filter.

Is That Pinging Sound from Your Furnace?

Is there a ping, ping, ping sound coming from your furnace? If this is the case, it’s quite normal and nothing to be concerned about. As previously stated, ductwork expands and contracts in response to temperature variations. The pinging noise is caused by your ductwork moving as the furnace turns on and off.

Why is My Furnace Whining or Squealing?

Your furnace may emit a high-pitched screech from time to time. We’re here to tell you it’s a belt, not an animal. A blower belt is included in every furnace. The belt can get misaligned, worn out, or require lubrication after enough use. If you notice this noise, ask a technician about it during a tune-up, and they should be able to fix it.

Is That Crackling Sound Bad?

A cracking sound from your heater, believe it or not, is typical and nothing to be concerned about. As the hot metal in your ductwork and your furnace cools and turns off after a heating cycle, it might generate a crackling noise.


Well, that’s pretty much it about the furnace noises mystery which has been explained to you in detail. Now you know all the possible noise which might be coming from the furnace, and their possible solutions. But if you are still not able to resolve the problem or issue by yourself then you may consult a professional technician for a permanent solution.

Frequently Asked Question (FAQs)

Why is my furnace making a popping sound?

We have possibly provided every detail about the different noises the furnace can make and their possible solutions. Still, here is a summary following may be the causes of the popping sound:

  • Furnace Burner Unclean
  • Dust, grime, and other organic waste can easily enter your furnace
  • especially if it’s located in the attic
  • Gas might build up as a result of this organic debris
  • As a result, when the flame ignites, the furnace may create a popping noise.
  • Metal ducting could be another source of popping sound
  • When the temperature in your home changes, the metal ducting will expand and contract, which is entirely natural and nothing to be concerned about.

Can a furnace explode?

The quick answer is that your furnace has the potential to explode. However, this is exceedingly unlikely, especially given the stringent safety requirements used in the construction of modern furnaces to reduce the possibility of an explosion.

How do you know if your furnace is going to explode?

High-pitched, grinding, rumbling, popping, screeching, or slamming are examples. This could be caused by simple difficulties such as loose components in the system or more serious concerns. In any case, you should contact a professional to investigate the problem.

How much does it cost to replace a furnace blower motor?

The average cost of a furnace blower motor is $450; however, the actual price is determined by labour costs and parts costs. Some higher-end versions include huge or difficult-to-reach motors, which might cost up to $2,000 to replace an HVAC blower.

Why is my furnace sounding like a helicopter?

It’s generally a gas issue if your furnace sounds like a plane or jet engine taking off. A line or valve could be leaking gas. You may have a broken heat exchanger that is leaking gas if you hear a click before the swooshing sound.

How long do furnace motors last?

Despite the manufacturer’s claims that their blower motor will last two decades, we recommend that all clients expect a 10-20-year life span owing to age, use, and proactive maintenance.