Any 550 owners have issues with their Rheostat (the fan speed adjustment dial)? Mine doesn't work right when it is turned all the way to the left (high) just before turning it off. I can only get about 3/4 speed out of it. On full high it goes slow like it is on slow speed. I called the Dealer about it and he is checking with Jotul on the Warranty. He said he thought it was only 1 year on this part but I asked him to check as their warranty talks about it but under the heading of Gas products. The wait stinks as I feel like I can't get the maximum heat out of the unit and it has been cold here in CT. Luckily it warmed up today but cold is coming back soon.