I have an odd problem that just started this season. The fan turns on that purges the combustion chamber then a few seconds later the flame is lit, the problem is sometime later if I put my hand over the exhaust its blowing cold air like the flame went out but it doesn't relight itself. I have to turn the knob to a lower temp then put it back to where I had it and then it works fine for a while then may or may not go out. I don't know if its the wind that is blowing out the flame or something else? Does anyone have experience with these heaters?
Any help would be appreciated, Rich