By no means am I an expert in the field but I was ready to replace mine, the controller until I stopped and took the time to follow the tests to the tee to check system as Kwikee has laid out online. Well to my surprise and relief it led me to a bad wire connection in the harness to the controller. The wire inside the harness was green and had corroded to the point of no connection. Cut off a short piece of the wire at both ends of the poor connection. Reattached and sealed connection and re wrapped and steps work great. Cost 20 cents and some time to test and trace. All I am saying is do the test as laid out on the Kwikee website and follow the results to the proper fix. Grounds and wire connections are so suspect on these motorhomes and components. Good luck happy hunting. Let us know what you find.