I have an Enviro Milan insert. The last couple of weeks the flame in the stove has been acting very strange. When I say strange I mean it is extremely high and for short bursts of time it gets so large that the flame literally covers the back wall of the stove. It's to the point where I think it's a safety issue where the flame may go up into the hopper and set the pellets on fire. I'm not sure if this is possible but I'm still new to stoves. I have this behavior with both my Lacretes pellets and most recently Lignetic pellets so I don't believe it's the pellets. I tried turning the air flow down and it seemed to get worse. I thought by having less air come into the burn pot it would settle the flame but that wasn't the case. 1)I have noticed that the burn pot is filling with pellets and there seems to be a mass of burning pellets in the middle of the burn pot 2)When I vacuum the burn pot does have hard ash on the bottom of it and this never used to happen. The pot was always flakey ash that you could vacuum right up 3)Probably irrelevant but this all started one day when I turned the stove up to High. I never run my stove on high. One day I had it on High for a few hours and it has been happening every since. 4)This happens regardless of the setting, on low it’s not as bad but I have never seen the flame this high on the stove. 5)The burn pot seems to have allot of pellets in it My best guess is that perhaps I changed the feed rate? I didn’t do it on purpose I know that. Would this cause the issue? I also noticed that there is a TON of ash on the heat exchanger, I’ve never seen this much ash on the exchanger. I did the leaf blower trick but have yet to clean the actual stove. I know this is a long post but I’m not quite sure if it’s safe to keep using the stove until I figure this out.