Faulty solenoid?

[Fine Gardens Landscaping]

Sprinklers pop up only partially when turned on via the clock. They pop up fully when turned on via the valve bleed screw. I'm guessing bad solenoid but I want to prepare for other possibilities. Is there other things that could cause this issue?

Thanks in advance
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[txirrigation]

Ohm the solenoid, and check for voltage.
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[Sprinkus]

Sounds like the diaphragm or a clogged solenoid discharge port.

[Mike Leary]

Pull the field wires at the valve and check for voltage, I have a feeling it's either a bad connection at the clock or a shorted field wire.

[Wet_Boots]

the smart money is on the blinker fluid

[1idejim]

E/R=I

Other than that it's prolly hydraulic.
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[muddywater]

Like others I would want to know the output of voltage at the clock and at the valve. If it is 24+ at both ends that would say it is not an electrical output problem. If the solenoid doesn't ohm 24+, it might be a bad diaphram. It seems to me solenoids ohm out differently. Rainbirds tend to be 50ish and Hunters 20ish. If it ohmed out ok, I would replace diaphram.

If it is a hydraulic system, your gonna need to contact Jim!

[muddywater]

Originally Posted by 1idejim

E/R=I

Other than that it's prolly hydraulic.
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What does E/R=I mean for the ignorant on this forum(me)?

[muddywater]

Originally Posted by Sprinkus

Sounds like the diaphragm or a clogged solenoid discharge port.

Also, good this is what irrigation flags second life are for.

[Wet_Boots]

Originally Posted by muddywater

What does E/R=I mean for the ignorant on this forum(me)?

baby steps Ohm's Law