I have the Genie Lawn model 54000. The sprinkler system shut off but there's still a little water constantly coming out from the sprinkler head. I have replaced the new sprinkler head but it does not fix the problem. Also noticed there's quite a bit of water gushing out when I tried to remove the entire sprinkler and replacing it with a new one.
What he says is true but didn't mention that it could be the zone valve leaking by.shut your system off for a few days and see if the water continues to drain.
Water will continue to run back down the hills to the lowest Heads and Some water will come out.It will stop once the water in the lines has Drained out.
Inside the valve is a seat and a rubber disc that closes it off. Chances are there's either debris on the rubber or it has rotted, causing a little bit of water to flow past the opening. There's a diaphragm assembly kit for it for less than ten dollars at your local sprinkler or irrigation store. To replace it you have to shut the water pressure off to the valve, unscrew the screws holding the top to the body, then remove the top and diaphragm assy. Be careful to not lose the spring on the top of the diaphragm. Once it's open and parts removed, it may be necessary to flush the valve. To do that turn the main pressure on for a moment and all the water (and possible debris) will shoot out the top. Be careful as this can be quite a gusher. Think "Old Faithful"
Then, making sure the seat (round opening in the bottom of the valve) is clean and free from debris, place the new diaphragm assembly, with the spring on top, into the body making sure it sits square. Then replace the top, or bonnet, and carefully screw the screws back into the holes. I say carefully because the screws are stainless steel and the body is plastic and will strip easily. Only tighten them snug, then about an eighth of a turn, in a star pattern so as not to warp the bonnet. When you turn the pressure back on you'll see if you did it correctly when there are no leaks. If there are little jets of water shooting from the side then you can gently tighten the corresponding screws.
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