I have been having problems with my pellet stove. After 6 yrs. & a new combustion fan & convection fan things were going well until a few weeks ago. Lately I have had a lot of cinders & the flame is burning very hot & high. I have always used the same pellets from same co. as all the people I know with pellet stoves. I clean my stove a couple of times a week just the basic type & once a month the extensive cleaning where I use the snake drain in the holes by pellet shute, all the wire brushing, vacuuming ect. My damper has always been set on the same level so I can't figure out whats wrong. Can anyone help? Thanks.