When the sprinkler system won’t stop running, water keeps flowing into the yard and possibly the street or near the house.
The first step is to stop the water. Then figure out whether one zone or several are running, which points to the cause.
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Quick Answer
If your sprinkler system won’t shut off, close the irrigation shutoff valve if you can safely reach it. If one zone keeps running, a valve isn’t closing. If several zones run, a controller, master valve or wiring problem is more likely. Turning the controller off helps tell valve problems from controller problems.
What You May Be Seeing
- Sprinklers running continuously
- Water flowing with the controller off
- Several zones running at once
- Water running into the street
- Soggy areas
If the controller is still sending signals, turning it off stops the water. If water keeps flowing with the controller off, a valve is staying open mechanically.
The First Question to Ask
Does the water stop when the controller is turned off?
If it stops, the controller, its programming or wiring is likely the cause. If it keeps running, one or more valves are stuck open.
If the Water Stops With the Controller Off
A controller or wiring problem is likely.
Common causes include:
- Controller fault: sending a constant signal
- Programming: overlapping programs or manual run left on
- Wiring short: energizing valves
If the Water Keeps Running With the Controller Off
A valve problem is likely.
Common causes include:
- Stuck valve: debris or torn diaphragm
- Master valve stuck: with a zone valve also open
- Manual bleed open: left open
One Zone Runs Nonstop
See our guide to a sprinkler zone that won’t shut off.
All Zones Run at Once
Several valves opening together suggests a controller, wiring or master-valve issue.
You Can’t Find the Shutoff
Many systems have a dedicated irrigation shutoff near the backflow preventer or main supply. A professional can help locate it.
What You Can Check Yourself
- Close the irrigation shutoff if you can safely reach it
- Turn the controller off and see whether the water stops
- Note which zones are running
- Check for a manual run left on
What a Technician May Test
- Controller and output tests
- Valve inspection
- Master valve inspection
- Wiring tests
Most Common Causes
- Valve stuck open
- Controller fault
- Wiring short
- Master valve problem
- Manual bleed left open
Repair or Replace?
Most cases are repaired by cleaning or rebuilding valves, or by repairing the controller or wiring. Controller replacement is only needed when testing shows it has failed.
When to Call a Sprinkler Professional
Call a professional if:
- You can’t stop the water
- Several zones run at once
- Water is near the foundation
- The controller doesn’t stop the water
Find a sprinkler repair pro or read our emergency shutoff guide if water won’t stop.
Related Sprinkler Problems
- Why Won’t My Sprinkler Zone Shut Off?
- Why Won’t My Sprinkler Valve Close?
- Why Isn’t My Sprinkler Controller Working?
- Can My Sprinkler System Cause a High Water Bill?
Related Repairs
Typical Repair Cost
What you pay depends on the cause, the parts and your area. See our Sprinkler Valve Replacement Cost Guide for typical ranges. Prices vary, and only an on-site diagnosis can give you an actual quote.
Frequently Asked Questions
How do I stop my sprinkler system from running?
Close the irrigation shutoff valve if you can safely reach it, then turn the controller off.
Why does my sprinkler system keep running?
A stuck valve, controller fault, wiring short or master valve problem.
Is a sprinkler system that won’t shut off an emergency?
It can waste a lot of water and cause damage, so stop the water and schedule a repair.
Where is my irrigation shutoff?
It’s often near the backflow preventer or where the irrigation line leaves the main supply.
Bottom Line
When a sprinkler system won’t shut off, stop the water first, then check whether the controller stops it.
A technician can repair stuck valves, controllers or wiring so the system runs on schedule again.
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