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When sprinklers will not stop, determine whether the controller is still commanding the zone or the irrigation valve is mechanically stuck.

A failed solenoid can prevent an irrigation valve from opening electrically, but wiring and controller faults can create the same symptom.

A zone with almost no sprinkler pressure can be caused by a large leak, restricted valve, supply issue, or broken piping.

A sprinkler zone that will not shut off may have a stuck valve, debris, diaphragm damage, or a manually opened solenoid or bleed screw.

Sprinklers running during rain may be caused by a bypassed rain sensor, sensor failure, wiring trouble, or smart-controller weather settings.

Mower and edging damage can crack sprinkler bodies, break nozzles, tilt risers, and damage fittings below grade.