We had an electrician hook up the pump relay and low flow control. The control box is an ESP 4 (rainbird). Our problem: the pump will start and run great...for 60 seconds then it shuts down Why? While it is running it has plenty of pressure and fills the zones. We could probably run more than one zone at once if we wanted. The timer/controller is set to run for 15 minutes. Regardless of which zone, or even just running hoses off the pump, 60 seconds is all we get. Any suggestions?