My furnace has a vibration for about a second at the end of the heat cycle.




Last Updated May 31, 2017 18:21 PM

A few weeks ago my furnace developed a vibration that can be heard throughout the house. If I remove the side panel of the furnace or if I remove the filter, the vibration goes away. My theory is that the fan works fine when it doesn't have to work hard but when pulling air through the filter (which is new) it has to work harder and vibrates.

My questions are: does this make sense? And if so, how can I troubleshoot it further?

-Edit- the old piece of junk ended up dying yesterday. We are replacing the unit.

Answers 3

Try putting pressure on random things to isolate the location. Take the top panel off and start there. I'm not sure how you can check the rest if it doesn't do it while you have access open to deaden random things.

Try tightening the motor mounts and the blower cage bolts. Then do every screw you can find. A last resort might be shoving toothpicks in between where two...

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FAQs about why a furnace turns on after call for heat has ended:

These questions & answers help diagnose & fix a heating furnace blower fan that cycles on and off after the call for heat has stopped. For safety this furnace fan cycling problem should be diagnosed and repaired promptly. This article is part of a series of heating furnace blower fan diagnosis & repair procedures given free at Content suggestions are always welcomed.

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One of the most common issues in early winter, are Gas furnaces that wont stay running! They repeatedly cycle on and off, only heating for 2-5 minutes. This is commonly referred to as Short Cycling.

You may have a gas furnace thats several years old yourself. During a cold snap the furnace won't heat the house to desired temps. It will turn on, ignite and provide heat for a short period of time and then turn back off, after only a few short minutes of relief.

Many people jump right at replacing the thermostat, hoping it will fix the issue, but alas, its not likely the problem. You may see a flashing light which is a diagnostic code and may flash 3 or 4 times. You can refer to your user manual, which is usually left on top of the furnace, to diagnose these codes. Many short cycle issues are caused by something simple like a dirty flame sensor.

Short Cycling is caused by one main thing- your furnace overheating, and the safety mechanisms, automatically shutting...

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