Hardie Rain Dial 9‑Station Display Reverts to PM – Microprocessor Failing

Display keeps switching to PM despite resets. Battery tests 9 V.

Remove battery, power off 1 minute, power on without battery.
If persists, microprocessor failing. Replace panel or controller (Irritrol Rain Dial).

Irrigation: Hardie 9‑Station Controller Replacement: Irritrol Rain Dial; Resetting a Rain Dial Hardie Controller (Model P/NHHA11272); Rain Jet RJC-66 Flashing "1C/2C" Error—Relay and Wiring Check; Hardie Rain Dial 1993: Zones 6 & 7 Run Together—Crossed Wire or Controller; Resetting a Hardie Rain Dial Controller to Factory Defaults for Manual Run Limits; Hardie Rain Dial Won't Activate Sprinklers After Rain Shutdown; Programming Hardie Rain Dial for Weekly Watering Schedule; Hardie 6-Station Indoor Controller Runs 15 Seconds Instead of 15 Minutes; Rain Dial 6/9/12 Station Controller Dead After 10 Years: Reset or Replace; Programming a Hardie Rain Dial: Using A, B, C Programs for Different Schedules

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