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.
Best Answer
I read this post last night when one of the blowers in my system started vibrating, shaking the entire house. The comments above encouraged me to look into it myself, and I wanted to share what I've found in my case for the benefit of anyone in a similar situation.
In my case, it seems the Installation Instructions were left inside the unit and pages of it got jammed on the blades, causing the imbalance. After I removed these,
everything went back to normal. The AC is 6 years old, so these instructions must have been there since the installation, probably taped to a side panel internally.