Help with Jotul F 500
I have a Jotul F 500 Oslo, and have had it for 4 seasons now. I have always loved it--it heats my 1000 sq ft basement office very well. But in the past three weeks or so, I've been unable to keep a hot fire in it. It's as though, when I close the door, the air cuts off and the fire just cools down and will eventually go out if I don't maintain it constantly. The damper is always wide open, so that couldn't be the problem. It's never done this before. Any idea what could be the problem?