The motor pack is failing and will need to be serviced which is not a do-it-yourself sort of project. Of course that may not stop you from trying but you will find that parts are not available inside the motor pack and that replacing it, if necessary, is best done in a service center to maintain new motor warranty. For price estimates on a replacement or to browse a FAQ on dolphins check out our site at www.arrowpools.net or you can contact the manufactrure's US rep at www.maytronicsus.com.