Question
I have a Hunter Pro-C.  One station (drip) is pulsing on and off.  Even the icon in the box pulses with the water.  I replaced the celluloid and the diaphragm but the problem remains.  What is left?

Answer
Hey JJ, it sounds as if the controller is defective. Try moving the field wire in the back of the controller to another empty station if youhave one. For instance, if the station that is pulsing is station #2, take the wire off the terminal strip in back and move it to station #6 and then see if it works on this station. If it still pulses, then it could be in the field wires going from the controller to the valve. If it works good on another station, then the controler is defective on this particular station. Good luck and have a great day.