Furnace Service: Common Furnace Sounds And Their Meaning

furnace service

One of the issues you will experience with your furnace is the unit making weird noises. According to furnace service professionals, the furnace makes a wide range of noises that have different meanings. The most common ones being:

Loud bang

Does it sound like there is a war in the attic? Gas might have built up in the system. You shouldn’t ignore this problem as it can be dangerous. The gas might have build up due to many reasons with the most common reason being dirty burners. When the burners are dirty, they delay ignition.

The loud bangs can cause the heat exchanger to crack which might require you to undertake expensive repairs.

In most cases, the noises come from the furnace. If they aren’t coming from there, they might be as a result of expanding or shifting of ducts in the HVAC system.

You need to hire a professional who will inspect the unit and determine the source of the noise. Obviously, the contractor should fix the source of the noise as soon as it comes about.

Screeching sounds

Screeching sounds indicate a serious problem with the furnace. The sounds come about due to many reasons with the common ones being:

A loose blower fan that might be hitting the blower housing. It’s possible to fix the furnace if the blower wheel or fan hasn’t been damaged. If the fan has been broken, you have no way out, other than to replace it.

Another reason might be due to the dislodgement of the motor and blower assembly. The two might be dislodged and they are now hitting the housing. You need to hire a furnace technician who will inspect the furnace and fix the problematic parts.


Rattling sounds are indicative of a loose screw or panel. You only need to identify the loose part and tighten it. Sometimes the noises don’t come as a result of a loose screw. In some cases, it’s as a result of a crack in the heat exchanger, which is a big problem.

A faulty heat exchanger can leak deadly carbon monoxide gas into your house, putting your life and that of your loved ones in danger. When having this problem, you should contact an experienced professional who will help you with the identification of the problematic area and fix it.


Rumbling noises are indicative of a poorly maintained furnace. When is the last time you hired a furnace tune-up professional? If it has been more than a year, you should consider hiring one who will inspect the unit and fix any issues that might be there.

When hiring the contractor, ensure that he/she is certified and experienced enough to provide you with excellent services. You should be cautious of some contractors that place extremely low prices on their services.

These contractors end up costing you too much as they provide you with substandard services. If the contractor’s price is too low, you have a reason to worry. The same thing applies if it’s too high.

Squealing sounds

This is a serious problem that requires a professional’s attention. If your furnace has a belt-driven fan, the sounds might be due to a loose or damaged belt. Sometimes the sounds might be due to poorly lubricated parts. In such a case, you only need to lubricate the parts.

Heating service repair Long Island professionals observe that the screeching sounds are a sign of the blower malfunctioning. For you to fix the problem, you should hire a repair professional who will identify the source of the problem and fix it.

As mentioned above, ensure that the professional you hire is certified and experienced enough.

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