Toro Vision 1 System Requires Manual Bleeding of Master Valve

Master Valve Diaphragm Failure Causes Manual Bleeding Requirement

A Toro Vision 1 system has a master valve (small buried valve with a bleed screw/pin) that must be manually bled to start each zone. The controller lights up but no water flows until the bleed screw is opened.

Diagnosis

The master valve's diaphragm is worn out. When the bleed screw is opened, water relieves pressure above the diaphragm, allowing it to lift. A healthy diaphragm would lift automatically when the solenoid energizes.

Fix

Replace the diaphragm in the master valve. It's a straightforward rebuild; see irrigationtutorials.com for step-by-step guides. If the valve body is cracked, replace the entire valve.