Nelson Controller Reset Procedures by Model

Homeowner needs to reset/reprogram Nelson irrigation controller but doesn't know model-specific procedure.

Model-Specific Reset Instructions

Nelson 8100 Series

Unplug transformer AND remove batteries → wait for LCD to turn off → reconnect transformer → reinstall batteries

Nelson 8400 Series

Disconnect transformer → press reset switch on back panel near batteries

Nelson Smart-EZ

After battery install: press black reset button on back of front panel (preserves programs). For factory reset: press AND hold reset button + SELECT key simultaneously → release reset first → close panel → power on.

Nelson Smart Zone

When adding PLUS4 board: press reset on back of front panel. For total factory reset: hold Current Day button + press/release #1 button → returns to defaults, OFF state.

Identify your model number (inside door or on transformer) for exact procedure.