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JH 4000 Controller Blinking Display: Sign of Impending Failure

JH 4000 Display Blinks but Zones Work; Battery Changed

The JH 4000 is obsolete (pre‑1999). No manuals found. A blinking display with functional zones indicates the controller is nearing end of life. Plan for replacement soon.

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JH 4000 Controller Blinking Display: Sign of Impending Failure

JH 4000 Display Blinks but Zones Work; Battery Changed

JH 4000 Display Blinks but Zones Work; Battery Changed