The Clean Filter Indicator will remain red if there is reduced airflow. To increase the airflow, check the Upper-Tank, Pre and Post-Motor filters for debris. Clean if needed. The black filters can be washed in a mild detergent. Ensure they are dry prior to re-using.
Check for clogs in the upper hose by detaching the hose from the back and inserting a broom stick handle into the hose to push any obstruction through to the opposite end. Also, check for clogs in the lower hose by removing the screw which attaches it and straightening this hose to relieve it of any dirt and debris. Using a broomstick handle, push any dirt and debris through. If the indicator continues to remain red, please take your machine to a local BISSELL Authorized Service Center. You can locate a Service Center online or by phone, 24 hours a day, by calling 1-800-263-2535 and choosing option #1.