Recently we had a problem and it turned out to be the circuit board. In pulling on the telephone cable I had torn the connector out of the board and it was done, I could not get it to work, there seemed to be another connector on the other side of the board, that did not work either. The cost for a repair/replacement was $60 from Happijac. Since we had added an electric roof lift last year and since the wireless remote would also run the roof motor we bought the wireless unit upgrade. No more connector issues. Happijac was good to work with and since we were on a trip they got things moving very fast to meet our schedule. I really like the wireless unit, its great.
Our camper came with a crank for the Happijacs. Otherwise hit Harbor Freight and get one of their allen socket sets and a 1/2 adapter for your portable drill. On our trip I used the hand crank since I did not have my drill along.
Good luck.
Rick