One of the most common reasons for a valve to keep running continuously is the accumulation of debris in the diaphragm, which prevents the valve from closing. This video will teach you how to clean the diaphragm on your valve.
The most common reason for a valve to remain on, or weep, is debris. New installations without proper flushing, recent mainline repair, or well water can cause debris to flow into the valve and get caught between the diaphragm and the seat. Check for debris using the following steps:
It's also possible that there is debris in the valve, which is causing the diaphragm of the valve to remain open.
It's possible your valves have been opened manually. You'll need to locate your valve box(s) and turn the solenoid(s) clockwise until snug. The solenoid is located on the top of the valve and looks like a cylinder with two wires protruding out of it.