First, turn off and unplug your vacuum. Give the vacuum a good once over. Check to see if the belt is worn, broke or missing. If the vacuum has a bag, check to see if it is full. For bagless units, make sure the filters are clean. Also, check all the hoses and airflow areas to ensure they are free from, cracks, debris and clogs.
If you are still having a problem, be sure to reference your models user guide for handy troubleshooting tips. Other possible causes include incorrect height adjustment setting, hose not attached to suction opening, twist and snap hose not securely attached, rotating floor brush bristles are worn or jammed, clog in vacuum, dirt container is full or not installed properly, or louvers are missing or installed incorrectly.
If you are having problems with your BISSELL vacuum, please contact the Customer Support department.