piece of junk, less than a year old and the roller won't work. I checked the belt, it's intact, the motor and roller aren't bound up, they move freely yet the roller won't spin despite the green indicator light being on. JUNK. I checked the harness connecting the motor to the board etc, just stopped working, JUNK. If it's a broken sensor or bad wiring... screw this Shark brand junk, never again. WORTHLESS JUNK.