If a rain sensor is not shutting off the irrigation system, which factor should be investigated?

The functionality of a rain sensor is crucial for preventing unnecessary irrigation during wet conditions. When a rain sensor fails to shut off the irrigation system, it is important to examine the wiring and sensor placement first.

Wiring issues may include faulty connections, broken wires, or poor contacts, all of which can disrupt the sensor's communication with the irrigation controller. Additionally, the placement of the rain sensor can significantly affect its performance. If the sensor is installed in an area that does not receive enough rain (e.g., under trees or near structures that shield it), it will not function properly. Ensuring that the sensor is unobstructed and positioned appropriately for optimal rainfall detection is essential for its effective operation.

Other factors like system timing control, water quality, and irrigation scheduling may influence the system's overall effectiveness, but they do not directly relate to the specific functionality of the rain sensor itself. By focusing on wiring and sensor placement, one can quickly identify and remedy issues that prevent the rain sensor from performing as intended, ultimately maintaining the efficiency of the irrigation system.