Clicking Solenoids Across Multiple Valve Boxes? Controller Likely Faulty

If solenoids in three separate valve boxes click asynchronously (different rhythms) while the system isn't scheduled to run, the controller is sending erratic signals — a classic sign of controller failure.

Why It Happens

Solenoids click when they receive voltage. Random clicking = random voltage output from controller. This is typically a microprocessor or relay driver failure on the main board.

Diagnostic Test

• Disconnect field wires from controller.
• If clicking stops → controller is sending phantom signals.
• If clicking continues → induced voltage from nearby power lines (rare).

Action

• If system waters correctly on schedule: Monitor; replace controller at convenience.
• If erratic watering or no watering: Replace controller immediately.

Note

Valve or solenoid failure doesn't cause clicking across multiple independent zones simultaneously. The common denominator is the controller.