Mr Sprinkler Repair

Sprinkler Repair

Mr Sprinkler Repair

Why Won’t My Sprinkler System Turn Off?

Having a sprinkler system that won’t turn off is not only frustrating but also wasteful and potentially damaging to your lawn and garden. Understanding why this malfunction occurs is essential to resolving the issue and can save you from a hefty water bill or unwanted landscape flooding. Here, we discuss a few common reasons your sprinkler system may be stuck in the ‘on’ position and the steps you might take to correct it.

Possible Causes of a Sprinkler System That Won’t Shut Off

1. Sprinkler Valve Failure

Valves are responsible for regulating the water flow to your sprinkler heads. A valve that fails to close will cause the sprinklers to continue running. This could be due to debris blocking the valve, a damaged diaphragm, or solenoid issues.


  • Clean the valves to remove any dirt or debris.
  • Inspect the diaphragm for damage and replace it if necessary.
  • Check the solenoid; it may need to be tightened or replaced.

2. Manual Valve Left Open

Sometimes the issue can be as simple as a manual valve being left open, either intentionally or by accident.


  • Locate your manual valves and ensure they are in the ‘off’ position.

3. Broken Sprinkler Controller or Incorrect Settings

A faulty irrigation controller—or simply incorrect settings—can cause your sprinklers to run continuously.


  • Reset the controller according to the manufacturer’s instructions.
  • Replace the batteries if the controller operates on battery power.
  • If the controller is defective, it may need to be replaced.

4. Leaky Sprinkler Valves

Wear and tear can lead to a valve leaking. This constant leakage can appear as if the sprinkler system won’t turn off.


  • Inspect the valves for any visible signs of damage.
  • Valves often need their worn parts replaced or could require complete replacement.

5. Low Water Pressure on Sprinkler System

In some instances, low water pressure can prevent a valve from closing properly, leading to perpetual sprinkling.


  • Check for leaks in your water supply that could cause low pressure.
  • Consult with a professional to assess your system for pressure-related issues.

6. Sprinkler Electrical Malfunctions

Wiring issues such as a short circuit can send continuous electricity to the valve solenoids, keeping them open.


  • Inspect wiring for damage and make repairs as necessary.
  • Hire an electrician or a professional irrigation specialist to assess and resolve complex electrical problems.

Professional Assistance May Be Required

If you have gone through the above troubleshooting steps without success, it might be time to call in a professional. A certified technician can provide a thorough inspection and diagnose issues that may not be apparent to the untrained eye.

A sprinkler system that fails to turn off can usually be attributed to issues with the valves, controller, wiring, or water pressure. Through methodical troubleshooting, you can often pinpoint and correct the malfunction yourself. However, when in doubt, don’t hesitate to reach out to a professional for help. Remember, preventative maintenance is key to avoiding these issues in the future. Keep your system clean, monitor for leaks, and service it regularly to ensure long-term, problem-free operation.


If you have any questions or need any type of sprinkler system repair, the experts at Mr Sprinkler Repair will be glad to help. Give us a call or 855-695-1000 to set an appointment.