If you have run times for various zones entered into multiple programs (ex. A,B,or C), the irrigation controller will run those zones for the amount of time entered.  Some controllers may have a slide switch that allows you to select a program to view and make change to.  These types of controllers will run the various programs regardless of the switch position.  Other types of controllers will allow you to choose a program that is displayed on the LCD screen.  You can view and make changes to the various programs (ex. A,B, or C) by scrolling through them on the controller’s screen.  The controller will run all programs that have zone run times entered in them regardless of which program is being displayed on the screen.

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