If your specific sub-model utilizes a battery backup to keep time during power outages, replace the battery once every year before the spring startup.

Do you need help identifying the for installation? Share public link

With the dial in the position, press the Manual Start/Advance button.

Moves the cursor to the next setting or station during programming.

: You can increase or decrease watering times globally in 10% increments to account for seasonal changes.

Note: A "Start Time" is the time of day the entire watering cycle begins. Setting one start time will run all programmed stations sequentially (Station 1, then Station 2, then Station 3, etc.). Do not set a start time for every individual station. Turn the dial to .

You have two options here: use one of the six pre-set schedules or create your own.

Select 1–6 on the dial to choose from varied daily, odd/even, or specific day intervals.

: Return the dial to Auto/Run for the timer to begin its automatic cycle. Key Features

The Rain Bird ISA 304 is a reliable, no-frills indoor sprinkler timer, perfect for homeowners seeking an affordable way to automate watering for up to four zones. Known for its user-friendly design, it allows both manual and automatic operation, helping you conserve water while keeping your landscape healthy.

If you do not have the original physical manual that came with your ISA 304 timer, do not worry. Because the ISA 304 is a discontinued model, the official manual might not be prominently displayed on the Rain Bird homepage, but it is still accessible through third-party user manual archives and the manufacturer itself.

This usually indicates an electrical short circuit in the wiring of the station number displayed, or a faulty solenoid valve coil.

...and I can find the exact troubleshooting step from the Rain Bird Support Center for you. Rain Bird ISA 300 / 400 Series Sprinkler Timer Manual

Pay close attention to the and PM markings on the dial to avoid reversing day and night schedules. 2. Set the Current Day

Some users report that after the programmed schedule completes, the timer starts again about three hours later. This is usually caused by a second start time or a second program (Program A, B, or C) that has the same stations and run times but a different start time. Check all three programs (A, B, C) and clear any unintended start times or zero out run times for stations you do not want to water.

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