The EcoSurfer S2 runs but makes a rattling or rattling-from-inside noise while skimming. This is a mechanical or debris fault, not a battery or connectivity problem.
If the EcoSurfer S2 makes a rattling noise while running, something is loose or caught inside the drive or skimming path. First remove the unit, clear any debris from the propeller and the intake, and check for a loose filter basket or a foreign object rattling in the housing. If the noise persists after clearing and reseating, a propeller, bearing, or internal component is loose and the unit needs warranty service.
What a Rattling Noise Usually Means
A rattling noise on a pool skimmer almost always means something is loose or caught in the moving parts. The most common causes, in order, are: debris (a twig or pebble) rattling against the propeller or inside the housing, a filter basket or cover that isn’t fully seated, and a propeller or internal bearing that has worn loose. Because the unit still skims and powers on, the battery and controller are fine — this is a mechanical fault.
Clear Debris and Reseat the Parts
1. Remove the S2 from the water and power it off. 2. Open the housing and clear any debris from the propeller, the intake, and the filter basket. 3. Reseat the filter basket and any covers firmly — a half-clipped basket rattles loudly. 4. Check the propeller for chips or a loose fit, and spin it by hand to feel for a rough or wobbly rotation. 5. Return it to the water and listen — if the rattle is gone, debris or a loose basket was the cause.
Rattling vs Propeller Twitching
A rattling noise from inside is different from a propeller that visibly twitches or stutters — see our propeller twitching guide. If the noise comes with reduced skimming, it may be a propeller or motor issue — see our motor and propeller guide. This page covers a unit that runs and skims but rattles.
Still Not Working? Contact Support
If clearing debris and reseating the basket don’t stop the rattle, a propeller, bearing, or internal component has worn loose. Submit a warranty ticket with your serial number and a short video that captures the rattling noise. Note whether the rattle is constant or only at certain speeds — that detail helps support pinpoint the loose part. This is not something a software reset can fix.
