Things You'll Need
Instructions
Touch the sides of the sprinkler panel. Many panels have a side hatch that locks the panel̵7;s front cover. If yours has such a hatch, unlock it with your fingers, and then open the panel.
Enter the correct combination, if your sprinkler system has a combination lock mechanism. Then open the system panel.
Unjam the panel, if it's stuck. If your panel will not open with your hand, you may need to use a screwdriver to prop the panel open.