Harman XXV making rumbling noise

[STOVEPRO]

I have a harman XXV pellet stove making a low level rumbling noise (kinda like a garbage truck parked out front). Noise is intermittent and gets louder when you open the hopper lid. Any ideas as to what the cause may be.

I have tried changing speed of dist. blower and it doesn't matter if the hopper is full or empty. When stove runs in test mode this problem will not occur.

 

[GVA]

In the search forums box, type in "woofing" this is what you are hearing 3 threads should pop up......
all pretty much point to the same thing...

 

[kyburnr]

I get a rumbling noise when the feed motor comes on. I guess it's normal. Mine is the only harman I have been around, besides the ones at the showroom when I purchased it.

 

[swalz]

I get the rumbling noise also, seems to be an issue with the XXV's.