"Master valve" LED on = short on MV wire or solenoid. Dial to Manual-Single, press OFF to resume. But fix short or it will retrip.
Rain Bird ESP-8Si: PR OFF Fixed, But System Still Won't Run - Check Master Valve
Hardie TC12b Master Valve Output Only 2V? Check AC Power & Transformer
Rain Bird RC Series Pump Start Wiring: Use Master Valve Output
Leaking Sprinkler Heads: Valve Diaphragm or Low-Head Drainage?
Reducing Excessive Pressure in a Drip Irrigation System: Install a Pressure Regulator
Wireless Remote Flow Control Valves for Irrigation: Options and Limitations
Locating a Shorted Solenoid on Hardie Total Control 12-Station System
Water Master 57161: Valve Turns On Briefly Then Repeats Every Minute
Greenkeeper 212 Timer Runs But No Water—Master Valve or Supply Issue
Programming Orbit Water Master 57606 for Two-Zone Schedule
Replacing a Master Valve In-Line: Union-Nipple Method for Tight Spaces
Solving Low Pressure in a Watermiser Drip Valve Caused by Anti-Siphon Pinhole Leak
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