Fixing a Hardie Inline Valve That Won't Shut Off

A Hardie 1-inch inline valve continues to run and leaks below the solenoid even after the diaphragm was replaced. This indicates the sealing issue may not be the diaphragm alone.

Potential Causes

• Missing or Damaged O-Ring: Some Hardie valves have a small O-ring on the stem directly below the solenoid. If missing, water leaks between the valve halves and prevents shutoff.
• Diaphragm Installation: Ensure the diaphragm is oriented correctly and the retaining screws are tightened securely.
• Solenoid O-Ring: The solenoid itself has an O-ring at its base. Verify it's seated properly and the solenoid is snug.

Troubleshooting Steps

Disassemble the valve carefully. Check for the stem O-ring, inspect the diaphragm for tears, and confirm all O-rings are in place. Reassemble with proper torque on the screws. If the valve body seat is cracked, a full valve replacement may be necessary.