RainPro HDC-4, Operating Manual, Page: 7 / 23

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2) Route the 2 wires from the sensor to the
bottom of the controller and connect one
each wire to the two “RS” terminals.
3) If the “Rain Sensor” switch on the front of
the faceplate is in the “ON” position and
no sensor is connected. The display will
show “SEN OFF” and no irrigation will
occur. To override the problem when no
sensor is connected-always leave the
“Rain Sensor” switch on the front panel in
the “OFF” position.