The solenoid is located in the valve control box. It controls the zones or areas of your sprinkler system. The valve has moving parts and can stop working at times. When this happens water will not flow to multiple sprinkler heads. In effect turning off the water to large areas of your lawn. If you think that you may have a bad solenoid valve please don’t hesitate to call us! We will be happy to fix it for you. We are a professional sprinkler repair company that takes pride in our neighborhood and doing our job right the first time.