Sprinkler valve won't shut off
Water still trickling from a zone after the controller turns it off? Two official Rain Bird fixes, in the order Rain Bird's own videos give them, plus the separate screw that fixes misting instead.
If a zone keeps leaking or trickling even after the irrigation controller has switched it off, Rain Bird's own troubleshooting videos for its residential valves name debris trapped inside the valve as one possible cause, and walk through two fixes to try in that order below: the bleed screw first, then the diaphragm. A third video covers a different symptom, heads misting or overspraying, which is a flow-control adjustment rather than a leak repair.
Step 1: flush the valve with the bleed screw
Rain Bird's video says sprinklers can keep watering a little even after the controller has turned off, and that one reason is debris caught inside the valve, keeping it from closing all the way. Opening the bleed screw can flush that debris out so the valve shuts properly.
- Slowly turn the bleed screw counterclockwise until water starts to escape from the top of the valve.
- Never completely remove the bleed screw while the system is live.
- Leave the bleed screw open for about 60 seconds, then turn it clockwise until it is hand tight.
- During normal operation, the bleed screw should always stay in the closed position.
Step 2: replace the diaphragm if bleeding doesn't fix it
If flushing the valve doesn't stop the leak, Rain Bird's video points at the diaphragm next: the valve can be in good shape everywhere else and still leak because the diaphragm itself is damaged. A diaphragm replacement kit is sold at most retailers that carry Rain Bird products, and Rain Bird describes swapping it as often a simpler project than replacing the whole valve.
- Shut off the main water supply to the irrigation system.
- Disconnect the wires to the solenoid, either by cutting them or unscrewing the wire nuts.
- Turn the solenoid counterclockwise to remove it, then use a narrow slotted screwdriver to take out the solenoid filter and insert the new one from the kit.
- Unscrew the bonnet screws and remove the bonnet.
- Replace the diaphragm with the one from the kit (it is designed to fit only one way) and replace the spring as well.
- Reinstall the bonnet and hand-tighten the screws, then reinstall the solenoid by turning it clockwise until hand tight. Rain Bird's video warns against over-tightening the solenoid, which can damage the valve.
- Reconnect the solenoid wiring with watertight wire nuts: the white wire on every solenoid goes to the common wire, which is also usually white, and each solenoid's other wire goes to its own power wire, each a different color.
- Turn the irrigation water supply back on.
A different symptom: misting or overspray
Not every Rain Bird residential valve has this next part. Rain Bird's video says some of its residential valves include a flow control screw, used to adjust how much water flows through the valve. If too much water is reaching the sprays, it can cause misting that wind blows off the target area, wasting water. To restrict water flow, the video says to turn the flow control screw clockwise; to increase water flow, turn it counterclockwise.
Which step should I try first?
Rain Bird's own videos present the bleed screw as the thing to try before replacing a leaking valve, and the diaphragm kit as the next step only if bleeding doesn't resolve it. Neither video names a part cost for the diaphragm kit itself; if you'd rather hire the repair out, published sprinkler repair pricing by job type covers professional valve replacement separately. This pair of fixes is specific to a valve that leaks when it should be closed, not to a zone that won't turn on at all; see when one sprinkler zone stops working for that separate symptom.
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