Water supply is off
After winter, repairs, or plumbing work, the irrigation shutoff or backflow valves may still be closed.
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If the timer says the sprinkler system is running but no water comes out, the issue may be the water supply, master valve, wiring, solenoid, or controller setup.
Yes, a sprinkler timer can look like it is running even when no water comes out because the timer only controls electrical signals; it does not prove water is available. The most common answers are that the irrigation shutoff is closed, the backflow valve handles are closed, the rain sensor is active, the master valve is not opening, or the zone valve is not receiving power. If no zones produce water, check the water supply first. If only one station has no water, check that zone’s wire, solenoid, and valve. The display counting down is not enough evidence that the system is actually watering.
| Question | Certain Answer |
|---|---|
| Most likely cause | Closed water supply, active rain sensor, master valve issue, bad solenoid, or cut wire. |
| Important fact | A controller can count down with zero water flow if the valve never opens. |
| All zones or one? | All zones means supply/master/common issue. One zone means station wire, solenoid, or valve issue. |
| Best next step | Confirm shutoff and backflow valves are open, then run one zone manually and listen at the valve. |
After winter, repairs, or plumbing work, the irrigation shutoff or backflow valves may still be closed.
Some controllers show watering time while the rain sensor prevents the system from running.
If the system uses a master valve and it does not open, no zones may receive water.
A bad solenoid, cut wire, or loose common wire can stop the valve from opening.
Start with the simplest checks: confirm the irrigation shutoff is open, the controller is not in sensor bypass/hold mode, and the correct program is running. Then test a zone manually.
If all zones have no water, look at supply, backflow, master valve, pump, or common wiring. If only one zone has no water, focus on that zone valve and wire.
Additional factual note: After winter, it is common for a timer to be programmed correctly while the outside irrigation supply is still closed. Always confirm the mechanical water valves before changing controller settings.
Additional factual note: If your system has a pump or master valve, that component must activate before zones receive water. A failed master valve can make every station look dead even when individual zone valves are fine.
Yes. The controller can count down even when the irrigation water supply is closed.
Likely water supply, master valve, common wire, rain sensor, or controller output issue.
That points to that zone's solenoid, wire, valve, or piping.
Only after checking water supply and programming. Resetting can erase useful settings.
Need help with sprinkler valves, heads, timers, wiring, rain sensors, or low-pressure zones in Toronto or the GTA? A proper diagnosis can prevent wasted water, lawn damage, and repeat repairs.
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