[schorert]

I have a similar problem and seems to be a relay panel or switch, have not chased it yet, the cord will retract but not extend.
I have found that I can pull the cord out manually by forcing it in and out slightly. the motor will disengage and the pully will turn with a little difficulty. switch seems to be the most obvious place to start, but the relay box is relatively accessible/well labled and inexpensive.