Quick answer: A sprinkler head may not pop up because of low zone pressure, a clogged nozzle or filter, a damaged head, soil packed around the riser, an underground leak, or a valve that is not opening fully.
One head or the whole zone?
If one head stays down while nearby heads operate normally, inspect that head first. If many heads barely rise, look for a zone-wide pressure, leak or valve problem.
Common causes for one head
- Dirt or turf restricting the riser
- Damaged internal spring or seal
- Clogged nozzle or screen
- Broken fitting beneath the head
When several heads stay down
Multiple heads failing together can indicate an underground pipe leak, partially opening irrigation valve or insufficient flow. Replacing heads one by one will not correct a zone-wide hydraulic problem.
For diagnosis and repair, see our sprinkler repair service and our guide to low pressure on one sprinkler zone.
