Hydro Rain HR 6100 Wiring: Identifying Loose Common and Station Wires

Two wires came loose in your HR6100 timer: a white wire from Lead #3 and a black wire from Lead #4. The controller uses white as common, colors as hot leads—but field verification is essential.

Standard Wiring Convention (Most Systems)

• White = Common (C) — connects to one wire from every valve solenoid.
• Colored wires = Hot (Station 1, 2, 3...) — each connects to the other solenoid wire on its valve.

Recommended Connections

• Lead #3: White → Common terminal. Red → Station 6 terminal.
• Lead #4: White → Common terminal. Black → Station 2 terminal (since Red=1, White=2, Green=3, Blue=4 on this lead).

Critical: Verify at the Valves

Go to the valve box. The common wire is the one where one wire from every solenoid joins together. Confirm its color (white, black, etc.), then ensure that same wire connects to the controller's Common terminal. All other colored wires should connect individually to station terminals.

If the field wiring uses a different color code, match the controller to the field—not the other way around. Consistency at the valves is what matters.