I have a system that pulls water from a lake. The system covers 1 1/2 acres. There are apparently 3 manual main zones but I've only found 2 boxes. I have a rainbird controller. I've replaced the pipe coming from the lake to the pump. I've replaced the pump with a new 2hp pump and while the pump works and water comes out a hose valve by the pump, no water comes out of any sprinkler head. Is there a way to find the 3rd zone box since it's low voltage and why does the water not reach the heads?
