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Fix an irrigation system that will not water

We'll check the controller, valves, and water supply—or tell you when to call a plumber.

Troubleshooting · Home plumbing
20–45 min
What you'll need
  • Screwdriver (for manual valve operation)
Step 1 of 6

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Steps

Goal: Check the controller, main supply, and zone valves.

  • Verify the controller has power and a schedule. Manually run a zone.
  • Check the main supply valve. Open the zone valve manually with a screwdriver.
  • Good: Water flows. Bad: Call a plumber.

Check controller

Goal: Ensure the controller is on and programmed.

  • Check power and schedule. Use manual run to test a zone.
  • Good: Zone runs. Bad: Check main supply and valve.

Check valves

Goal: Verify the zone valve opens.

  • Open the valve manually. If water flows, the solenoid may have failed.
  • Good: Valve opens. Bad: Supply line issue—call a plumber.

When to get help

Call a plumber or irrigation specialist if:

  • The main supply is on but no zones get water.
  • The valve will not open manually.

Verification

  • Zones run when manually started.
  • Schedule runs as programmed.

Escalation ladder

Work from the device outward. Stop when the problem is fixed.

  1. Check controller Verify power and schedule; manually run a zone.
  2. Check main supply Confirm the main valve for irrigation is open.
  3. Check zone valves Manually open the valve; clean if stuck.
  4. Call a plumber No water with supply on, valve will not open—call a plumber or irrigation specialist.

What to capture if you need help

Before calling support or posting for help, have these ready. It speeds everything up.

  • Controller power and schedule
  • Main supply valve position
  • Manual zone test result
  • Valve condition
  • Steps already tried

Does the controller have power and a schedule?

The controller must be on and programmed to run.

Check the controller display. Verify the schedule is set. Good: controller on and scheduled. Bad: no power or no schedule—fix those first. Manually run a zone to test.

Yes No

You can change your answer later.

Does a zone run when you manually start it?

Manual run tests the valve and supply.

Use the manual run feature. Start one zone. Runs: controller and valve work—check schedule. Does not run: check main supply and zone valve. Open the valve manually with a screwdriver to test.

Yes No

You can change your answer later.

System is working

Manual run works. If the schedule does not run, reprogram the controller. If it runs on manual but not on schedule, the schedule may be wrong.

Done

Is the main supply valve open?

The main valve must be open for any zone to get water.

Check the main shutoff for the irrigation system. Open: check the zone valve—open it manually. If it opens manually, the solenoid may have failed. Closed: open it and test again.

Yes No

You can change your answer later.

Does the valve open when you turn the bleed screw?

Manually opening the valve bypasses the solenoid.

Turn the bleed screw or manual open on the zone valve. Water flows: solenoid failed—replace solenoid or valve. No water: supply line may be broken—call a plumber.

Yes No

You can change your answer later.

Call a plumber

Call a plumber or irrigation specialist if: the controller has no power, the main supply is on but no zones get water, or the valve will not open manually. Supply line or valve replacement may need a pro.

Done

Reviewed by Blackbox Atlas

Frequently asked questions

Why would an irrigation system not water?
Common causes: controller off or misprogrammed, main supply valve closed, a stuck or failed zone valve, or a broken supply line. Check the controller and main valve first, then manually test zones.
Can I fix an irrigation system myself?
Yes. You can check the controller, open the main valve, and manually run zones. You can clean or replace solenoid valves. If the supply line is broken or you cannot find the issue, call a plumber or irrigation specialist.
When should I call a plumber for irrigation?
Call a plumber or irrigation specialist if: the main supply is on but no zones get water, a zone valve will not open, or the supply line is broken. Valve replacement and line repair may need a pro.

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