Furnace noise
Furnace has gotten louder - hard to describe but like something is loose and vibrating when fan motor is running. I took the outside cover off and didn't' see anything obvious - the fan doesn't appea...
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Foreign object? Our furnace got very loud after a year of use. Couldn't sleep with it running. Techs found the installation instruction sheet had been left in the furnace/blower space by the factory. It had gotten lodged in the fan. Removed it and all was well.
