Rain Bird 100-DVF Valve Buzzes But Won’t Open Fully

Flow Control, Solenoid Port, or Internal Obstruction

A buzzing solenoid means it’s getting power. First, turn the flow control knob (center of bonnet) fully counterclockwise. If that fails, the solenoid exhaust port may be clogged. Unscrew the solenoid ½ turn past seepage to vent. If still no go, remove the bonnet and check for debris in the valve body or a torn diaphragm. The DV-100 is reliable—odds favor a small stone lodged in the inlet or flow control passage.