: The timer is typically secured with two #10 screws. A 9V battery should be installed to preserve programming for up to six hours during power outages. Programming Your Schedule

If the screen is blank, check the AC transformer and ensure the 9V battery isn't dead.

To stop watering temporarily (e.g., during rain or vacation):

Since Rain Bird no longer manufactures the ISA series, physical manuals can be hard to find. This guide covers the essential programming, troubleshooting, and operation instructions based on the standard ISA 304 platform.

You can choose "Specific Days" (e.g., Mon, Wed, Fri) or "Interval" (e.g., every 3 days).