I work on these things for a living.
Short answer, the firepot needs more air moving through it.
Could be for any one of several reasons.
DK
Exactly, I run my stoves 7x24, only clean them out every 2-3 weeks. It sounds like your not getting a clean burn, even with crappy pellets I have maybe a coffee can worth of ashes a month.
If you have a newer house that's air tight you might need a external air intake, I put them on both my stoves.
