This may be caused by a break in the line or a valve that is not completely open.
- Fire the zone and walk around the general area. If there is a break, water will begin to flow to the surface. Excavate and repair the damaged pipe.
- If you are unable to locate a break, find the valve that controls the zone. Open the valve manually by turning the solenoid. If this repairs the problem, you likely need a new diaphragm.