Another "quick fix" solution - make sure the engine is not running . . .
I've had that head scratcher moment when my awning would not retract when it worked just an hour earlier - I finally figured out that there is a cut off relay related to my ignition circuit. It was intended to prevent the awning being extended while the engine is running, but it also prevents it from being retracted. I had purposely left the awning out as long as possible when we were stopped for lunch as a hot sun was beating down on that side. When we got everything started back up - no ability to pull it back. A quick pucker moment, but checking for a running engine is now my first "go to" when something isn't operating like it should (on my coach, same "power cut-off" issue with the slides and the leveling system . . .)