On Kwikee we also need to know if it's old "Square control box) or newer "Looks like a triangle" control box (Really a trapizoid but that don't matter).
However I will make a suggestion.
All the plugs near the control box (Under the RV with the steps out. above the top extended step when the steps are in) unplug and re-plug a couple times and see if it helps.
next step is the fine manual and a volt meter to see if teh switch is working or failed.
There is a 5 amp fuse somewhere that may have popped as well.
NOTE: also check for voltage on the Ignition sense lead as that will override the switch on both old and new.. I think (am not sure without checking) that's the yellow wire.