Originally Posted by Haycon
Actually it was about 95 degrees when I bought it. I actually don't remember them checking the furnace with me.
For the future, or for someone else, all you have to do is run the AC and cool down the interior enough to get the heater to turn on. I would never pick up a travel trailer without checking every single function. It avoids issues just like this. You learn how to use it AND you learn that it works as designed.
Either way, take it back to your dealer and have them diagnose and fix it.