Furnace Service: 8 Furnace Sounds That Mean Trouble

furnace service

Furnace sounds give you peace of mind that your appliance is functioning optimally. Unfortunately, a failing appliance makes sounds that indicate problems, and you have to hire furnace service providers to help you diagnose the issues and fix them.

A failing furnace can produce a wide range of sounds such as:


Booming sounds in older furnaces indicate a buildup of gas from a delay in ignition. You will hear this sound when engaging the furnace.

When you experience this sound, contact a professional service technician immediately, especially if you can smell natural gas around the furnace.


Scraping means that metal is rubbing on metal, which isn’t suitable for any appliance, including your furnace. Metal on metal contact means that a part of the furnace has come loose. It also can mean some foreign material has been trapped in the furnace.

The sounds not only making it uncomfortable to live with the furnace, but they also can be a hazard to the safety of your home.

When you hear the sound, turn off your appliance immediately so that you don’t cause any further damage.

Just like with boom sounds, ask an experienced HVAC professional to inspect the problem and fix it.


A clicking noise is an indication of a faulty flame sensor. You will also experience the noises when you have a problem between the ignition and gas. Just like the other sounds, you need to give immediate action to the sounds so that you can stop them.

Loud bang

A loud bang or pop when starting up the furnace means you haven’t cleaned your appliance in a while, and you have dirty furnace burners. The dirt on the burners can prevent the burners from igniting immediately; hence gas builds up fast.

When the burners finally ignite, you hear the bang or pop, which is a small explosion taking place.

It’s extremely dangerous to ignore the problem as it often leads to more severe issues such as a cracked heat exchanger.

It can also lead to a larger explosion. To fix the problem, clean the burners. You can do the work by yourself or hire an expert to help you out.

For you to prevent the problem from coming about, hire a tune-up professional at least once a year to tune up the furnace.


Squealing sounds indicate a failing fan motor or faulty belt. You will experience this problem when you don’t regularly inspect your furnace, so you let the belts run until they break. When the belt breaks, the blower no longer turns.

When you notice the sounds, ask an HVAC technician to inspect the appliance, and if the belt is broken, replace it.

If the problem is coming from noisy motors, lubricate them. For ideal results, use high-quality oil designed for your type of motor.


When you hear thumping or banging sounds, it means that your furnace is on its last legs. While scraping and popping noises are fixable, banging sounds mean that your furnace is seriously struggling to do its job, and its time you think about replacing it.

In most cases, banging sounds indicate more significant problems that might be too expensive to repair. You will be better off simply replacing the unit.


Is your appliance making rattling sounds that aren’t subsiding? It’s a sign of worn out or broken motor or fan components. If you don’t fix the problem early enough, you will start experiencing more serious rattling sounds.

Or even worse, the sounds will change to thumping sounds that signify a dying furnace.

Just like with the other furnace sounds, when you experience rattling sounds, you should shut the furnace and contact an experienced professional to help you with the inspection of the source of the sounds and fix it.

Whining sound

Your heating appliance will emit high-pitched whining sounds when the bearings in the blower motor aren’t properly lubricated.

While the sound isn’t as serious as the other sounds, when you hear it, you should address it as soon as possible to prevent other parts of the appliance from getting damaged.

You should hire a furnace repair service Long Island provider to inspect the appliance and lubricate the blower motor. The expert should also check the other parts of the unit and fix any present problem.

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