When I saw your original post pop up I almost asked that question but thought better of it. These are the easy fixes though. Too bad all problems aren't as easy to fix.
Just last week I pulled my coach up in front of my house to begin loading it. I left the diesel running because I was going to put air in a couple of tires but it was really hot so I was going to put out my power awnings to provide a little bit of shade.
Neither would extend but when I pushed the retract button I could clearly see that they were engaging the motors to retract. Just when I figured I would have to head to the shop before our trip a little light went on.
Yep, there's apparently a lock out that prevents the power awnings from being extended while the engine is running. Makes sense but I've owned the rig for five years and never knew it.