Why is my furnace so loud?

Lubricate the moving parts of your furnace properly during bi-annual tune-ups to keep your furnace in peak performance throughout winter

If your furnace is making unusually loud noises, it is crucial to pinpoint the origin of the noise to solve the issue. Noise can indicate an underlying serious problem that may end up damaging your furnace. Multiple different components can cause loud noises, each producing a different one. Furnace noises are a warning sign of an impending danger that you should not ignore, although you wouldn’t even if you wanted to. If your furnace produces a loud rattling or screeching noise when you turn on your furnace, the bearings in your blower motor or your blower motor itself could be the culprit. The blower motor pushes warm air out of your furnace and into your living space through the ductwork. Your blower motor requires routine lubrication and usually a particular type of lubrication to upkeep optimal function and performance over time. Otherwise, your fan might seize up, causing a loud screeching or rattling noise. You may be having a loose or damaged blower belt. If your furnace has a belt-driven motor, a squealing or similar noise may ensue when the belt loosens. Another reason for squealing noise can be attributed to shaft bearings and other moving components becoming dry. Lubricate the moving parts of your furnace properly during bi-annual tune-ups to keep your furnace in peak performance throughout winter. If you experience a loud clanking or scraping, described as metal against metal sound, it signals a serious problem with your furnace’s blower wheel. Dirty burners that need cleaning may cause a loud bang or boom, while a faulty heat exchanger with a loose panel or screw may cause rattling noises.

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