I had installed a sprinkler system about 7 years ago using Nelson products with a six zone control panel. This has been a rental unit for six years and my tenant never used it. I found several sprinkler heads either broken or missing. I replaced them and installed new batteries in the controller and manually turn on one zone and nothing happened, so I tried another zone. Same thing. I then went to the valves and noticed that they were buried and cleaned out all the dirt around them. Everything l...
