Hi, on the menu bar is "search this site" Search capacitor. Most likely a capacitor is bad. This is a messy and difficult fix but can be done. To replace the pump which will can be purchased at Aquaqualitypools.com, cut the wires and rejoin them with heat shrink butt connectors found at any home store. Before splicing, a tube of Heat shrink insulation must be slid over the wire and then placed over the butt connector splices and shrunk with a heat gun or good hair dryer. This heat shrink material is found at Home Depot and Lowes. Bottom line, if you have no experience with this type of work then take the robot to a repair facility