Hopefully someone can help me. I have a Grundfos CU301 system (pump and controller). This system operates the irrigation for my property. The controller regulates the pressure on the system. Recently the pressure dropped from 70 psi to 40 psi. Over the years I have been able to walk up to the control box and raise or lower the pressure as needed. Last week the controller "froze" and will not allow me to make any adjustments. A red "lock" symbol is now evident. By going on line and talking to a couple of pump guys I have discovered that a special "R 100" remote control is needed to disable the lock. Does anyone have an R 100 controller that I could get hold of or some experience in disabling this safety from inside the controller.
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Irrigation pump problem