If the brush is not rotating, please remove the access plate and inspect the brush and brush belt. If the brush belt is broken or stretched, it will need to be replaced. If something gets caught in the brush and prohibits it from turning, it may cause the brush belt to slip off. If the brush belt has slipped off but appears to be intact, you can replace it by looping it over the motor shaft. The BISSELL PowerForce uses a Style 7 belt. Style 7 belts can be purchased at many popular retailers and can also be ordered from BISSELL Consumer Services either online at http://www.bissell.com or by calling 1-800-237-7691, Monday - Friday, 8 a.m. to 10 p.m. or Saturday, 9 a.m. to 8 p.m. ET.