I had pretty much the same problem with our then new 05 Cherokee lite. the furnace wouldn`t come on the first time we needed it (45deg. nite in MT.) the next morning I ended up removing the furnace screen and tapping the gas valve when the furnace tried to ignite. the furnace fired right up and continued working for the next couple of years right up untill we traded for our current trailer.
Here`s a stupid question......are your propane tanks full? I only ask because I have experience with this and a water heater that wouldn`t light!!!!!
02 Ford Excursion V-10 4.30 gears 5 Star Tuner Y-pipe mod Hellwig sway bar Rear Airbags
Prodigy and Dual Cam
07 Cherokee 32B
Better to have a bad day of camping than a good day at work!