I know what you are going through. We own that thing also. On the hand held remote look for the symbol of a flame with a small dot in the middle. Not the solid one.Then push the orange button in the middle. You will see the red light on the air cond. come on that reads System. Wait for a few min and it will come on.
It will also work on 12 volt. Take the owners manual and burn it! Not a bit of help.
When you get mad it it and through it outside that will not help. I did it and we had no heat that night. I love the trailer but that remote is a pain!