I have a used Jotul Classic 3 vent-free gas stove. I think these models are now known as a GF 3 Allagash. The man I purchased it from didn't know if the stove worked (it was stored in his garage and not hooked up). I haven't connected it to a gas line yet because I'm concerned that the gas control knob, near the ignition button, doesn't work properly. The manual for the GF 3 BV Allagash shows a drawing for the control valve that does not look exactly like Classic 3 that I have. Mine has a single knob with a variable adjustment that indicates "on" for the pilot and then "high" through "low" settings. When I turn the knob, it does not seem to rotate. When I press in and rotate, it moves a little more freely, but still not through all of the settings. Has anyone had this problem? do you think the stove is safe to operate?