The newer style Timer on the Autofog is slightly different than on past models. Previous models used a pin-set timer where one pin is placed at the starting time and one is placed at the stop time.
With the new units, the pins do not remove from the timer. Instead, the pins are flipped outward from the dial.
IMPORTANT: All pins during the operation time must be flipped outward, not just the starting time and stop time pins.