[rverdlm]

Lauren, there are many possibities, but I think the thermostat is not the problem. RustyJC mentioned the fleme detector and sail switch. I'd also check the gas supply i.e. pressure and flow. Have you taken a flashlite and looked into the 2 holes on the exterior of the trailer. One is intake and one is exhaust. Any restrictions like wasp nest will cause your problem. These furnaces can be very sensitve and have many sensors anyone of which can cause problems.