Work out whether the fault is hydraulic or electrical
A zone that fails to open can be caused by lack of water pressure, a blocked valve, failed solenoid, broken control wire or incorrect controller setting. A zone that will not close may have trapped debris or a torn diaphragm rather than a timer fault. We compare manual valve operation with the controller’s intended command, taking care not to confuse a leak downstream of the valve with a valve body leak. Knowing whether the problem affects one zone or the entire system narrows the investigation.
