I've been searing for weeks trying to find someone else that has had this issue with no luck. Here's a fun one! Sorting out our new to us 2006 Fleetwood Sea Pine and the furnace is acting VERY strange. We have a "common" Atwood 7916-II furnace. When I first got it, the furnace wouldn't turn on. Took the t-stat apart and noticed the contact wire (what connects the furnace contacts to turn on) was severed (looked burned). Assuming that was the problem, I took the t-stat out, jumped the wires, and voila the furnace ran! I ordered a new t-stat and the day I went to install it, tried jumping the wires and nothing happened. Confused, I walked away to get some supplies (volt meter, etc) and when I came back, jumping the wires worked. Figuring I did something wrong the first time, I installed the new t-stat. As soon as I flipped on the t-stat...nothing. Jumped the wires and it worked. So I assumed the t-stat was a dud and returned it. Bought another and installed it. This one worked great! Problem solved? We were camping this past weekend and the weather was getting down into the 40's at night. Perfect time to try the furnace! Reach down to flick on the t-stat, I hear it click, furnace didn't turn on, and smelled burning electrical. I turned it off, the smell subsided, took apart the t-stat and found the circuit board fried. I've traced all the wiring from the furnace to the t-stat and it looks 100% factory untouched. I can't find any evidence of shorts, everything looks perfect. Removing the control board in the furnace is the same, everything looks clean and untouched. No obvious signs of shorts or anything. I don't want to start blindly throwing money at the problem. I'm tempted to replace the control board, but at $100+, it's a pricey experiment if it doesn't solve the problem. It seems as though there's some sort of voltage controller or something that's intermittently failing in the furnace. I've read a lot about these systems, but haven't found anything about voltage regulation or whatever could be causing the death of t-stats. Seems like the leads that go to the t-stat shouldn't be carrying much voltage, and if there was a short somewhere, wouldn't the furnace just turn itself on instead of killing the t-stat? Any ideas?