I have had my stove since July 2008. Has run great until this year. Pellets continue to build up in the burn pot after 6 hours or so. I clean the stove daily including removing the back plates in the fire box weekly. I removed the exhaust blower and no ash build up. Cleanded exhaust pipe and checked flue. All have little amount of ash but nothing that should affect the stove operation. Prior to this year I was burning 100% hardwood pellets. This year I am burning Maine's Choice blend .5% or less ash. Reset the factory settings on the control board to 1-5-1m per tech on phone but that did not affect anything. This is a basement install with 2" fresh air intake. I'm starting to think the control board is not working properly. When I disconnect the power the board forgets the 1-5-1 setting and I need to reset. Any ideas?