I'm not a big fan of the stock controller, replacing it with a Victron would be my vote. However, the control panel probably can be reset:
1) Unscrew the faceplate mounting it to the wall
2) Carefully pull the assembly out of the wall of the trailer
3) There is a very normal looking "telephone wire" going into the assembly. Unplug it and wait a minute.
4) Plug it back in and the control will ( maybe ) reset and go back to working.
Before I replaced mine, I had to do this a couple times ....