Hardie RD-600 Display Frozen After Power Outage: Controller Failure

Hardie RD-600 Display Stuck at 7:57 After Power Outage

After short power outage, RD-600 display shows frozen time (7:57) and "1112" in corner even with power disconnected and battery removed. Unplugged, battery out 5+ minutes, no reset.

Diagnosis: Microprocessor/Display Controller Failure

Power surge during outage likely damaged the display driver or microprocessor. The frozen display with power off indicates internal capacitor holding charge or latch-up condition in display controller IC.

Repair vs Replace Decision

• 15+ year old controller design
• Repair cost ≈ replacement cost
• Modern controllers (Hunter Pro-C, Rain Bird ESP) offer:
• Seasonal adjust %, multiple programs, sensor inputs, WiFi options
• Better surge protection

Replacement Recommendation

Replace with Hunter Pro-C or Rain Bird ESP-Modular. Direct wire transfer (label wires first). RD-600 panel-only replacement may not fix if case/transformer also damaged.