Valve Won't Open

Symptoms

• No water comes out of any head on the zone
• Even the manual bleed screw doesn't activate the valve
• You can hear a faint click from the solenoid but nothing happens

Diagnosis

The diaphragm inside the valve is stuck closed due to debris, a torn diaphragm, or the upstream supply is shut off.

Step-by-Step Repair

1. 1

   Verify the main water supply to the irrigation system is turned on.

2. 2

   Locate the valve (usually in a valve box). Remove the valve box lid.

3. 3

   Try opening the valve manually by turning the solenoid a quarter turn counterclockwise (or opening the bleed screw).

4. 4

   If that doesn't work, shut off the water supply. Remove the screws holding the valve bonnet (top cover).

5. 5

   Lift off the bonnet and remove the diaphragm and spring. Inspect for tears, debris, or mineral buildup.

   Take a photo before disassembly so you remember the orientation.
6. 6

   Clean all parts. If the diaphragm is torn or stiff, replace it with a matching diaphragm kit.

7. 7

   Reassemble the valve in reverse order. Make sure the diaphragm seats flat with no wrinkles.

8. 8

   Turn the water back on and test both manual and electronic activation.