Richdel 446PR Hybrid Controller – No Valves Open

Richdel 446PR: Clock Works But No Valves Activate

Old Richdel 446PR (built‑in transformer) shows clock and pause but won’t open any of eight valves in auto or manual. All zones worked recently.

Two Likely Causes

1. Controller not sending 24 V to valves. Measure voltage at controller terminals (black lead on C, red on zone) while a zone is on. Should read ≥24 V. If not, controller is damaged.
2. Common (white) wire disconnected or cut. Check white wire at C port and continuity to all valves. Recent digging may have severed wires.