Why Sprinkler Heads Don't Retract After Watering

Common Causes of Stuck-Up Heads

Weak or worn return springs: If many heads stay up, the springs may be fatigued, especially on older heads.
Valve closing slowly or leaking: If only one zone's heads stay up, the valve may not be shutting off cleanly. Residual pressure keeps the heads extended.

Turn the valve's flow control stem fully open, then fully closed, then back to half-open. This can clear minor debris.
If that fails, disassemble the valve bonnet and clean the diaphragm, seat, and ports carefully.

Replace the valve internals if cleaning doesn't restore crisp closing.

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