Rain Dial RD-1200 Replacement: Flashing Time & OF1 Error

After replacing an RD-1200, if the display flashes time and "OF1", you have two issues:

Flashing Time

= Power loss + dead/missing 9V battery. Install fresh 9V battery.

= Short circuit on Valve 1. Check wiring on terminal 1 — replace solenoid on valve 1 (match wire color).

The RD-1200 will NOT run automatically until all three are set:

White wire → COM/GRD terminal. Colored wires → numbered terminals 1–12.

Irrigation: Rain Dial RD-600 Flashing Display After Year of Non-Use; Rain Dial Programming: Time/Day Setting Switch Position; Irritrol Rain Dial Runs Program A Twice—Extra Start Time Programmed; Hardie Rain Dial 1993: Zones 6 & 7 Run Together—Crossed Wire or Controller; Hunter Controller Zone Running Too Long: Programming Error or Hardware Failure?; Rain Dial Programmed But Won't Water: Check for Short or Bad Processor; Rain Dial 670301 Malfunctions – Replace Panel with Irritrol Rain Dial 6; Rain Dial Transformer Test After Power Outage; Hardie Rain Dial 900 Stuck in 12-Hour Mode: Can’t Set AM Times; Toro Vision II Plus: Station Run Time Dial Spins Without Effect

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