We have owned our P68 now for two 1/2 years, have been using pellet stoves for over 10. First season, the stove kicked butt. Second year, not so good and now it's really bad. Husband is a mechanic, so he always works on our own stuff and this one has him baffled. The colder out it gets, the smaller the flame and heat output. The warmer out it gets, the hotter it burns. Just changed the exhaust probe - it didn't make a difference. Purchased a new board, seemed to be better for three days, and now we are hit with the frigid temps and it burns as if its on low and is not keeping this old house warm at all. Can practically put your hand on the top of the stove. We don't have the t'stat hooked up, that was something we first tried, so it's set to stove temp. Anyone have any thoughts??