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Rain Dial 600 Shows "16F" - Won't Reset or Run Manual

RD-600 displays "16F" and won't reset or operate in manual mode.

Standard Reset Procedure

Remove 9V battery from panel
Disconnect AC power for 1 minute
Reconnect AC power with battery still out
Observe if display returns to normal (should show 12:00 or current time)

If Reset Fails

The panel (faceplate module) needs repair or replacement. Take it to an irrigation supply store - they can bench-test and either fix the circuit board or sell a replacement panel (~$100-120).

What "16F" Likely Means

On Rain Dial controllers, alphanumeric codes often indicate station faults. "16F" could mean Station 16 Fault (on a 12-station controller, this suggests internal logic error) or a firmware glitch. The reset clears most logic errors; persistent codes indicate hardware failure.

Irrigation: Rain Dial 600 Starts Sprinklers in SET Mode: Panel Repairable; Rain Dial RD‑1200 Drains 9 V Battery Monthly – Panel Fault; Resetting a Rain Dial Hardie Controller (Model P/NHHA11272); Rain Dial RD-1200 Replacement: Flashing Time & OF1 Error; Rain Dial RD-900: Zones 1 & 2 Low Voltage — Check for Short; Irritrol RD-600 "FU" Flashing Display—Fuse/Short Detection; Rain Dial Programmed But Won't Water: Check for Short or Bad Processor; Rain Dial Blank Screen: Test Battery, Transformer, Then Replace Panel; Rain Dial Transformer Test After Power Outage; Fixing a Hardie Rain Dial RD600 That Runs 7 Days a Week Instead of 3

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