kmtracy, In plugging the ribbon cable should act as a factory reset, but just in case to preform on you will need to turn your timer to off then hold down the reset button on the back of the display panel for about 10 seconds. You should see everything displayed all at once on your timer screen. Then it will go blank, and revert back to auto. If you want to you can unplug your timer from the outlet and then remove your ribbon cable. If your timer is hard wired then don’t worry about it. It unplugs on the side to the right of the transformer, just above your terminal strip. Your welcome. Just let me know if I can help in any other way.