First, make sure the air fryer is plugged in. You can also try using different outlets. Otherwise, the pan and basket may not be inserted properly. The best way to close your air fryer is to make sure that the rim of the pan is lined up with the track inside of the unit (along the top) and you are lifting the handle up as you push the pan straight in. The pan will not close if it is inserted at an angle. If this does not solve the issue, please contact our customer support team.