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ZONE WON'T SHUTOFF
I have a Nelson system and pump water from a lake. I know very little about sprinkler systems. This system was in when I bought the house.It is probably 12-15 years old and has run well for the 4 years I have lived here.
Zone 5 which consists of 4 pop up sprinkler heads continues to run even when I turn the contoller off. To shut the zone down I have to go down to the lake and turn of the pump. The Zone also runs when I cycle the other zones.
Find and fix the zone 5 control valve. You may have some debris from the lake gumming up the works.