Low Pressure on Auto, Full Pressure Manual Bleed – Diaphragm or Solenoid Port

Valves have low pressure on auto, full pressure when bled manually. New valve same issue.

Checks

Valve installed backward? Flow arrow must match direction.
Solenoid port hole blocked? Remove solenoid; run water—should flow steady. Clean with needle.
Controller output OK? (Valve opens, so likely yes.)

Bleed opens diaphragm fully regardless of solenoid port. Auto relies on solenoid port to bleed chamber.

Irrigation: Low Pressure in Auto Mode Only: Richdel Valve Diaphragm Replacement; System-Wide Low Sprinkler Pressure: Main Valve, Master Valve, or Diaphragm Issues; Low Pressure at Drippers – Pressure Regulator Likely Faulty; Low Pressure After Raising Risers – Leak or Diaphragm; Low Pressure on One Station of Six; Sudden Low Pressure on All Zones: Front and Back Yard; One Zone Lost Pressure: Hardie Valve Diaphragm Likely Culprit; Hardie Valve Requires Bleed Screw Open for Pressure – Solenoid or Port Issue; Electrically Actuated Valves for Ultra-Low Pressure Rain Barrel Systems; Diagnosing System-Wide Pressure Loss When Irrigation Runs

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