I have a enviro empress pellet insert. I have had it sine june and still feel that I have not figured it out. After 2 bags of pellets the ash pan is completely full. Keep in mind it is an insert and my ash pan is only about an inch tall. And after 8 hours of burning the glass is is so dirty that I cannot hardly see the flame. But what alarms me the most is the residue on the glass is brown and all the ash in the pan is brown. I think I am not getting a complete burn of the pellet. I have tried various brands of pellets with no change. I have also tried all the damper setting and combustion settings with no luck. Here is a few pics of what I am talking about. Anybody got any ideas?