Diagnosing Pulsing Zone on Hunter Pro-C Controller

A single drip zone pulses on/off on a Hunter Pro-C, with the controller display icon pulsing in sync. Solenoid and diaphragm replacement didn't resolve it.

Isolating Controller vs. Field Wiring

The pulsing display icon indicates the controller itself is sending pulsed output—not a valve issue. To confirm:

1. Locate the zone wire at controller terminal strip
2. Move it to an unused station terminal (e.g., zone 2 → zone 6)
3. Run new station manually

Interpreting Results

• Pulsing continues on new station: Field wiring or valve issue
• Normal operation on new station: Controller station output is defective

Since solenoid/diaphragm were already replaced, a field wiring short (nicked insulation causing intermittent contact) is possible. But the synchronized display pulsing strongly points to controller hardware failure on that station output.