Modern irrigation controllers can detect a shorted solenoid and bypass the affected zone. Since Irrigander expanders drive the controlled solenoids directly there is never an issue with an Irrigander expander activating the controller's over current circuit. However the Weathermatic Smartline® controller also detects an open solenoid circuit. Early versions of Irrigander expanders did not present the same load as a solenoid so the Weathermatic Smartline controller interpreted the Irrigander expander connection as an open circuit and registered a fault. We developed the Irrigander Controller Adapter to correct this issue. The Irrigander Controller Adapter presents enough of a load to the Weathermatic Smartline controller to allow the zones controlled by the Irrigander expander to operate correctly without affecting normal controller operation. See the table below for Irrigander expander models affected by this issue: