Make sure that you have properly followed the steps in installing the new part in your SmartClean V4 RoboVac. Fully charge the vacuum and ensure there are no other issues with its operation before attempting to install the replacement part. Check that both the vacuum and the replacement part are clean, dry, and not visibly damaged or malfunctioning in any way. If you still experience issues, call or email us at support@tzumi.com or 1-855-GO-TZUMI, and an experienced Customer Service representative will be more than happy to assist you.