Care taker in floor system

[Willosborne]

I have a clients pool that the heads do it pop up, at least 20 years old, new 2hp super pump, new clean clear 4 cartridge cleaner, 12 psi on the caretaker head , could the cleaning heads worn out and unable to pop up?

 

[chiefwej]

If none are popping up, I would be looking at the 6 port valve mechanism.