Thank you to everyone who has commented. I finally made it back to the camper yesterday, but only for an hour. Oddly enough, I decided to try disconnecting both propane tanks yesterday and try them again.
I did this without having read the comments, but when I had the directional valve pointed at Tank A I couldn't even light the stove. Then I went and changed the directional valve to Tank B and I could light the stove. That gave me some hope; so I turned on the propane hot water heater and I could hear it turn on and working.
Then I turned on the heater. The AC works just fine and when I switched to the heater the thermostat works and turns on the fan and the air blowing out wasn't cold. That said, it wasn't really hot either. It is difficult to say yet because it was 80 degrees outside and I'm guessing it may be difficult to tell in that temparature.
I will be spending this weekend at the camper and will be able to give it a more thorough test at night when the temperature is lower and I will have more time to let the heater do it's work.
I did check the fuse and it looked fine. When I removed it a red light on the panel lit up, and it turned off as soon as I replaced it so I believe I'm ok in that department.
I'm putting my money on the propane connection for Tank A is bad. I'm guessing that is a better problem to have than a faulty heater or circuit board; but I could be wrong.
The comment about a first time owner and relying on the internet to figure out how this thing works is dead on. The owners manual is totaly useless. It is generic for several models and essentially just refers me to the manual for each separate appliance (which I don't have).
I will report back after this weekend once I have more conclusive results.
Thank again for everyone's input!
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