If your sprinklers run twice a day, or start at times you didn’t expect, the cause is usually in the controller’s schedule.
This is one sprinkler problem that you can often fix yourself by reviewing the controller settings.
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Quick Answer
Sprinklers running twice are most often caused by multiple start times in one program, more than one active program, or a factory default program that’s still active. Review each program’s start times and active zones. If the schedule looks right and zones still run unexpectedly, the controller or a valve may be at fault.
What You May Be Seeing
- Zones run twice in one day
- Zones run on days you didn’t schedule
- The whole cycle repeats
- One zone runs again after the others finish
Most controllers let you set several programs and several start times per program. Each start time runs the full program, so an extra start time or an extra program can repeat watering.
The First Question to Ask
Does the whole cycle repeat, or just one zone?
If the whole cycle repeats, look at start times and programs. If only one zone runs again, that zone may be assigned to more than one program, or its valve may not be closing.
If the Whole Cycle Repeats
The schedule is the likely cause.
Common causes include:
- Multiple start times: each start time runs the whole program
- More than one active program: programs that overlap
- Default program: a factory program still active
If Only One Zone Runs Again
A zone-specific issue is possible.
Common causes include:
- Zone in two programs: assigned run time in more than one program
- Valve not closing: the zone keeps running or restarts
After a Power Outage
Some controllers revert to default settings after losing power, which can add a default program.
After Someone Adjusted the Controller
A start time or program added during troubleshooting may have been left on.
Cycle-and-Soak Settings
Some controllers split watering into short cycles on purpose. Check whether this feature is turned on before assuming something is wrong.
What You Can Check Yourself
- Review every program (A, B, C, etc.) and their start times
- Remove unneeded start times
- Check which zones have run time in each program
- Confirm the date and time
- Check whether cycle-and-soak is enabled
What a Technician May Test
- Controller program review
- Station output tests
- Valve inspection if a zone runs on its own
Most Common Causes
- Multiple start times
- Overlapping programs
- Default program active
- Zone assigned to multiple programs
- Valve not closing
Repair or Replace?
Most cases are fixed by adjusting the schedule. If the controller behaves erratically after the schedule is corrected, repair or replacement may be needed.
When to Call a Sprinkler Professional
Call a professional if:
- The schedule looks correct but the system still runs extra cycles
- A zone runs when the controller is off
- The controller behaves erratically
Find a sprinkler repair pro or read our emergency shutoff guide if water won’t stop.
Related Sprinkler Problems
- Why Isn’t My Sprinkler Controller Working?
- Can My Sprinkler System Cause a High Water Bill?
- Why Won’t My Sprinkler Zone Shut Off?
Related Repairs
Typical Repair Cost
What you pay depends on the cause, the parts and your area. See our sprinkler repair cost guides for typical ranges. Prices vary, and only an on-site diagnosis can give you an actual quote.
Frequently Asked Questions
Why do my sprinklers run twice?
Usually multiple start times or more than one active program.
How many start times should my program have?
That depends on your plants and soil, but each start time runs the entire program, so extra start times repeat all watering.
Can a power outage change my sprinkler schedule?
Some controllers reset to defaults after an outage. Check the programs after power returns.
What if a zone runs when the controller is off?
That points to a valve that isn’t closing, not the schedule.
Bottom Line
Sprinklers running twice is usually a schedule issue that you can fix by reviewing start times and programs.
If the schedule is correct and watering still repeats, a technician can check the controller and valves.
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