# Sprinkler zone not turning on: what to check

Updated: 2026-10-24 · https://pros411.com/en/guides/landscaping/sprinkler-zone-not-working

## Short answer

Check the controller first: it should not be on Off or Rain Delay, and that zone needs a run time. Start the zone by hand. If nothing happens, open the valve box and turn that valve’s solenoid a quarter turn counterclockwise. If water flows, the valve works and the problem is electrical: a wire, the solenoid or the controller. If it still will not run, the valve is stuck.

> Safety first: The wires in the valve box carry low voltage, but the controller plugs into a regular outlet. Unplug the controller before you touch any wiring, and never open its plug-in transformer.

## What to check when one sprinkler zone will not turn on

![Cartoon sprinkler head that will not pop up while another zone sprays behind it](https://pros411.com/img/guias/sprinkler-zone-not-working.webp)

1. **One zone stays down while the others spray.** The heads in that zone never pop up and the grass there starts to dry out. The other zones run, so the water supply is on.
2. **Check the controller and run the zone.** Make sure it is not on Off or Rain Delay and that the zone has a run time. Then start that zone manually and watch the heads.
3. **Open the valve box and check the wires.** Find the plastic lid in the lawn. Look for loose wire nuts, cut wires or chewed insulation on the two wires going into the solenoid.
4. **Turn the solenoid a quarter turn left.** On most valves this opens the water by hand. If the zone sprays now, the valve is fine and the problem is electrical.
5. **Runs by hand? Swap the solenoid.** Close the valve again. Shut off the water to the sprinklers, unscrew the old solenoid and screw on a new one by hand. Connect it with waterproof wire nuts.

## If no zones run at all

- The controller screen is blank: check the outlet, the breaker and the plug-in transformer.
- A rain sensor is wet or stuck: many controllers have a switch to bypass it for a test.
- The water to the sprinklers is off: look for a shut-off valve near the backflow preventer, the brass device with two handles near the house.
- Some systems have a master valve. If it fails, no zone gets water.

## Why a single zone stops

Most of the time it is a bad solenoid or a broken wire between the controller and that valve. Shovels, aerators and gophers cut wires. Less often, dirt gets into the valve and keeps the rubber diaphragm from opening. A valve that opens by hand but not from the controller points to an electrical problem.

## When to call a landscaper

- The zone will not run even when you open the valve by hand.
- Several zones stopped at once, or the controller screen is blank.
- You need to find or splice a buried wire.
- The valve leaks or the zone keeps running after it should stop.

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## Frequently asked questions

### Why is one of my sprinkler zones not turning on?

Usually a bad solenoid or a broken wire to that zone’s valve. Open the valve by hand: if the zone sprays, the problem is electrical. If not, the valve is stuck.

### How do I manually turn on a sprinkler valve?

On most valves, turn the solenoid (the small cylinder with two wires) a quarter turn counterclockwise. Some have a small lever or bleed screw instead. Turn it back clockwise to close it.

### How do I know if my sprinkler solenoid is bad?

If the zone runs when you open the valve by hand but not from the controller, and the wires are connected, the solenoid is the likely culprit. A pro can test it with a meter in a minute.

### Where is my sprinkler valve box?

Look for a round or rectangular plastic lid in the lawn or a flower bed, often near the house or where the water line comes in. Several valves can share one box.

### Can a rain sensor stop just one zone?

Usually not. A wet or stuck rain sensor stops every zone. If only one zone fails, look at that zone’s valve and wiring.