I have 5 zones and all work well in the past. The 5th zone has 5 spray heads, and 4 of the 5 pop up about only 1/3 and 1 doesn't pop up at all, and water is coming out very weak. If I pull the 1 up, all 5 will just pop up and start spraying perfectly.
When I try to pull the head up, I feel the pipe or water is sucking the head back. So I just pull it out for about 2 seconds then it will just stand there and spray without problem.
Does anyone know how I could fix this issue?
Can't figure what would cause a vacuum under a spray head.
I think that, for lack of a better idea, I'd swap that head with another one and see if the problem follows the head. If not you have a piping problem. Shovel time.
Just tried turn the 5th zone on manually again and again, it usually costs about 10-20 seconds to fully pop up. 15-20seconds is really long when you just watch and wait .
Thanks anyway, the problem seems just went away.