Welcome to Justanswer.com, my name is Dustin.I'm sorry to hear about the issue you are having, I will do my best to help you resolve it.
Have you tried pressing the tiny reset button and holding it for about 30 seconds.. Its located on the back of the control board and you can see it on page 67 of this manual
If that doesnt get it to start again.. You may need to disconnect everything, then reconnect it.. And try the reset switch again.
Other wise, a fuse may have blown or if your RV was sitting out doors in high heat, the control board itself may have fried.
Hopefully, the reset switch fixes the issue.. If not, let me know!
I strive to provide great service, and greatly appreciate a 5 star rating clicked and submitted when you are satisfied.. I always answer follow up questions.Dustin S.Senior Technician and Network Switching Systems Operator / Maintainer.