Lift up the vacuum if it is stuck in position. Set the Roomba back down in a new spot and press "Start."
Turn the robot over if the vacuum is not suctioning up dirt or debris. Clean the brushes and remove any long strings. Clean the wheels with a dry cloth and push the wheels in and release. This will help ensure that the wheels can move freely.
Clean the sensors under the bumper if the Roomba is bumping into walls or falling off stairs. Use a clean, dry cloth.
Hold the robot over a waste bin and tap the front bumper of the vacuum 20 times quickly if the Roomba is moving erratically, to remove dirt or debris.