If water continues to flow after the controller is off, what should be checked?

When a water system continues to flow even after the controller has been turned off, the most pertinent issue to examine is a stuck open valve or a malfunctioning master valve. Valves are critical components in irrigation systems, and their primary function is to control the flow of water. If a valve is stuck in an open position due to debris, mechanical failure, or wear, it can lead to an unintended and continuous flow of water.

A master valve serves as a primary gate that controls the water supply to the entire irrigation system. If it fails to close properly, this can also result in persistent water flow even when the controller signals it to stop. Thus, inspecting for these types of valve issues is essential for resolving flow problems in an irrigation system.

While sensor malfunctions, low battery issues, and air in the mainline can affect system operation, they wouldn't typically cause persistent water flow after the controller is off. Sensors are designed to respond to environmental conditions, and a low battery would likely cause the controller to malfunction rather than keep the water flowing. Similarly, air in the mainline can lead to pressure issues but does not directly result in a situation where water continues to flow. Therefore, checking for a stuck valve or a master valve failure is the