![]() ![]() Ailion recommends cleaning or changing the filter at least every three months, which will help the furnace run at maximum efficiency.Īnyone who’s ever lived with radiator heat knows how noisy pipes can be. When the filter gets dirty, a whistling noise can result. It can be caused by metal that’s rusted and chipped off, or soot that’s fallen down from the flue. More common in older systems, this is a sound you may hear when you start the furnace. This could be a sign of moisture in the gas line, or that the gas line has become clogged. (It may sound like a spinning washing machine that’s out of balance.) Over time, it could damage the entire system. Over time, the fan-and the cage surrounding it-can shift or become bent, and a banging sound could be the fan clipping the cage. Ignoring this could cause the motor to fail. This could be an indication that the bearings in the motor need to be oiled or that a piece of one has broken off. In between inspections, keep an ear open for the following: Most importantly, he says, if you haven’t run the furnace for several months, you want to be sure there aren’t any cracks in the heat exchanger, as this could lead to a dangerous carbon monoxide leak. In fact, he says, having the furnace inspected every six months will not only help your furnace run at maximum efficiency, but could help prevent some of these sounds from occurring in the first place. “And if the noise has just started, you could help prevent a more serious or complicated repair later.” ![]() “If an adjustment is needed, it’s not that expensive,” he says. If they’re unusual and persistent, have an HVAC professional check it out. There are a variety of sounds you might hear from the furnace, Ailion says. ![]()
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