The vents are on the machine to protect the motor from water damage. Water could be leaking if the Collection Tank is too full, if the machine is being used in a vertical position, or if the machine is being shaken while scrubbing the stain. When using the Spot Lifter, always keep it horizontal to the surface you are cleaning. For especially stubborn stains, you can remove the scrub brush and use it separately from the machine for a more vigorous scrubbing.
If you require additional assistance, please call BISSELL Consumer Services toll free at 1-800-263-2535 Monday through Friday from 8 a.m. to 10 p.m., or Saturdays from 9 a.m. to 8 p.m. ET.