I think the stove beings starving for air once the pellet build up begins because it covers the holes in the burn pot. I am burning North Warmth Douglas fur pelletsI still think the stove is starving for air. Stove isn't clean or combustion blower is weak/dirty.
![[Hearth.com] Whitfield Advantage II-T pellet build up [Hearth.com] Whitfield Advantage II-T pellet build up](https://www.hearth.com/talk/data/attachments/273/273156-e467988e61743ba1b7e3c84f7fd5c6f3.jpg?hash=pNB21sbi8L)