[LHaven]

I had this exact same symptom right after the dealer fixed the gateway module problem, and I had to bring it back. It turned out to be construction debris (sawdust and styro chips) fouling the sail switch in the furnace. They had to remove the entire unit and it was a month all told before we got our rig back.

In general, you will be finding a lot of sawdust for the first couple trips. I also had styro waste plugging up the intake screen on my toilet, with the result that I had almost no water flow the entire three weeks of our first trip.