Once again the bug has struck. I bought my first TT in 1968
. It was fine until I tried to light the furnace (used a match in those days) and it would not light. Called the dealer after a cold weekend and he said, Oh you probably have spider web in the orifice and told me how to fix it. No problem after that and for years I was OK. Fast forward to 2008 and my wife and I are cold in our 34' Airstream Excella at Disneyworld in January!! Furnace wouldn't light. When we got home I called the service man, (I'm an old guy now) and he came and ultimately took a relatively large bug out of the furnace orifice. So if it doesn't light, CLEAN THE ORIFICE!