Irritrol RD600 Pump Start Signal Every 60 Sec: Test Controller Output Continuity

Pump Should Get Continuous Signal, But Gets Pulsed; Relay Clicks, Pump Doesn't Start

Disconnect pump start wire at controller. Run zone, measure voltage at terminal continuously.

• Continuous 22–26V → controller OK; fault in relay or its wiring.
• Pulsed/low → controller or board fault.

If Controller OK

Test at relay wires. Continuous → relay bad. Pulsed → wire fault.