Furnace Noises You Should Not Ignore

article image For the safety and comfort of your home and family, it's important that you pay attention to anything out of the ordinary with your furnace. Some of the most telling signs of your furnace's health are the sounds it makes. Here are 5 noises that likely call for heating repair and should never be ignored.


If your furnace is squealing, there are several possible causes, including a damaged blower belt, a malfunctioning blower motor, and bearings that need to be oiled. For a proper diagnosis, it's best to bring in a professional to check your furnace and make the necessary adjustments and repairs.



There are 2 primary reasons for banging in your furnace, and neither should be left alone. A loud banging could mean that you have a problem with your air ducts, such as poor sizing, blocked air filters, or closed vents. Banging can also occur with dirty furnace burners, since a delay in ignition causes gas to build up and cause a small explosion. This pressure can crack the heat exchanger.


A scraping noise generally means that there is a problem with your furnace's blower wheel. Your blower wheel may be loose, broken, or fallen. The longer you let your furnace run with a scraping noise, the worse the problem will become. Instead, turn off your furnace immediately and call a professional to prevent further damage.


It's normal for a furnace to click for a moment when it is turned on and off, but more persistent clicking often means that something is wrong with the relay, ignition, gas, wiring, or electrical control. 


Rattling noises often indicate that something has come loose, such as a screw or cover panel. With any luck, you will be able to find the culprit and tighten it. In many cases, however, a rattling noise may indicate a much bigger problem. There may be a misalignment or malfunction in the motor or a leak in the heat exchanger. The latter issue can put your entire household at risk, as carbon monoxide may escape into your home. When in doubt about a rattling noise (or any unusual sound in your furnace), call a heating repair professional!