The RD-900 panel (faceplate with display/buttons) is a known failure point after 6–7 years. Symptoms: scheduled start flashes, manual run briefly activates a valve then dies, display stays on.
A used RD-900 likely has a panel near end-of-life. New panel gives fresh microprocessor, display, and keypad. Case, transformer, and field wiring stay.
Check battery compartment date code; if <2 years, warranty may apply.
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