If the vacuum pump runs without pulling or sealing, make sure you’ve allowed enough room at the top of the bag (3 inches). Ensure that you have placed the open end of the bag within the drip tray. Also, check to see that the top of the bag is flat without wrinkles. Double-check that Gaskets are all clean and free of tear (both top and bottom), it is recommended to wipe with a wet cloth. If none of the above work, place food into a new bag as the original bag may be damaged or have a hole in it. This can also occur if the machine seal bar has overheated, which will cause the appliance to pre-seal the bag before all of the air has been removed. Wait several minutes for unit to cool down before trying again.