Greetings! I am new to this so please bear with me. I have a summers heat 49-shcpm multi-fuel stove that seems to have a problem. Started burning for the first time in October. Everything was going great...burning ultra premium less than 1/2 percent ash wood pellets. Then yesterday I woke up and the stove was hardly burning at all. Heat range was at 7 blower at 8 and there was little more than a smolder in the burnpot. Even at 9 and 9 there is not much difference. I had everything tore apart cleaning what I could get to and doing the diagnostic test and everything checked out fine. I was running the flue pipe straight through the wall and dumping right out....thought that might be the problem so I added three ft. vertical to it with a 90 at the top, but I think it runs worse. I don't know if maybe there is ash down inside the exhaust system somewhere I can't get to? I did take the blower off and the clean-out plate on the left side and I could reach my hands in from the front and the back of the stove so that my fingers could touch and I could feel no blockages. Thank you for any help or suggestions.