Skimmer Equipment /
How Can You Tell If Your Skimmer Weir Spring Has Worn Out?
A worn skimmer weir spring can reduce surface skimming, cause rattling, or let the weir door stop returning properly. Learn the signs and safe checks.
Archive date: this article was written for PoolSkimmer on Oct 7, 2026 and given the earlier archive date of Oct 30, 2025 so the blog reads as an organized archive. It was not published on that date.
The function of the skimmer weir spring
At the front of a pool skimmer is a small flap, the weir, whose job is to draw in any floating debris. On most skimmers this is done with the aid of a spring-lock or spring-loaded mechanism that puts the flap back where it should be as the water moves. It does not matter if you have a CMP unit, a Hayward component or some other make; the objective is consistent surface skimming.
Over time a spring will wear down and you will see the skimmer’s performance suffer before the part gives out entirely.
Telling signs of a worn spring
There are telltale changes in both sound and behavior when the spring is on its last legs:
- You will hear the flap chattering, rattling or even slamming with the pump on, or perhaps a ticking and knocking near the opening.
- The weir door may hang open, be slow to close, or sit at an angle on its hinge rather than swinging smoothly.
- Debris like leaves and insects will go right by the skimmer instead of being drawn in.
- In some cases the plastic door itself appears cracked, warped or waterlogged, giving the impression of a bad spring.
That said, if the weir still has freedom of movement and the pool is being skimmed properly, the spring is probably fine. But once the flap stops rebounding and you can tell the skimming has gone downhill, the spring or the whole assembly is the culprit.
A safe way to inspect
Always shut off the pump before you get to work in the skimmer basket area. Put on gloves or whatever PPE is called for when dealing with sharp plastic or muck, and have your equipment manual at hand.
Proceed in order:
1. Verify the pump is off, then take the lid off. 2. For a better look you can remove the basket, but never put your hands in suction equipment while it is running. 3. Examine the spring and hinge for any rust, bent pins or cracks. 4. Give the door a nudge with your hand to check if it will return unaided. 5. If there is another skimmer on the pool, use it as a point of reference.
Resist the urge to force anything. Prying at a tired hinge or brittle white plastic will only break it.
What else could be the problem?
A faulty spring is not the only explanation for poor skimming. First rule out the obvious:
- Is the water level too low to provide adequate surface draw?
- Are the skimmer or pump baskets full?
- Is there something wedged up against the weir?
- Could it be a replacement weir that is not the right fit for the model?
- Is circulation weak due to some other equipment matter?
Often a clean basket and the right water level will put things right without needing a new part.
Deciding on a replacement
It is time to put in a new part or spring if the door will not come back after a cleaning, the hinge or body is damaged, or the piece is prone to jamming. Make sure to get one that is an exact match for the dimensions and model. A generic that is only an approximation will stick or chatter and do a poor job of skimming.
Time for a professional?
If the skimmer is difficult to remove or you are not sure whether the fault lies with the spring, the weir or the body of the skimmer, let a pro handle it. The same goes for any suspected damage to the suction plumbing or electrical side of the system. And if the water is not safe to be in because of equipment issues, do not swim. When in doubt, leave the pump off and consult an expert rather than trying to force a repair.