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Hardie RD‑900: Valves Click but Don’t Open in Manual; Auto Works Except Chatter on #3, #6, #8

In manual/semi‑auto, all valves flash “OFF” without opening. In auto, zones run but #3 (spray), #6, #8 (drip) chatter. After battery replacement, modes work but chatter persists. Dog damaged wires.

Diagnosis

Chatter indicates low voltage at solenoid (insufficient to hold plunger).
Test voltage at controller terminal for chattering zones (should be 22‑26 VAC).
If voltage good at controller, field wiring (damaged by dog) is the issue.
If voltage low at controller, panel or terminal board is faulty.

Field wires are the ones running from controller to valves. Repair dog‑damaged wires with waterproof connectors.

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