One of my sprinkler heads does not spray water. It is a pop-up sprinkler head for my lawn. I looked at the plastic screen behind the head and it is clean. Whenever I turn on the sprinklers that particular sprinkler head pops up but no water comes out so I have to manually open the screw valve on that sprinkler head to make the water spray. I thought I had too many sprinkler heads in that zone, but in my other zones there are more heads and they work just fine. What might be the problem?
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