Robot Pool Cleaner Floating and Won’t Sink? Fixes

What is going wrong

• 1Trapped airAir left in the housing is buoyancy the machine did not budget for, and it cannot hold the floor long enough to start a pattern.
• 2A flooded chamberThe filter chamber has to fill for the machine to sit at its working weight, and a sealed lid can stop it.

Why a cleaner floats instead of sinking

• Trapped air. Air pockets sealed inside the housing or filter chamber keep the unit buoyant until they are released.
• A waterlogged or degraded float. Many cleaners use internal foam floats or buoyancy chambers to control descent, and these can shift, crack, or absorb water over time.
• A clogged or saturated filter. A filter packed with fine debris can change how the unit settles and hold air against the media.
• Loose or aged seals. Worn gaskets or a poorly seated lid can let air stay inside where water should displace it.
• Wrong entry method. Dropping the cleaner in flat, on its back, or too fast traps air that a slower entry would push out.

Steps to get it to sink

1. 1

   Air purged

   Lower it in slowly and on an angle.

   Hold the unit at roughly forty-five degrees and submerge it gently so air escapes as water enters. Tilt it side to side under the surface until bubbles stop.

2. 2

   Filter clear

   Open and drain the filter chamber.

   Remove the filter or canister, empty any debris, and let water fully replace trapped air before reseating it.

3. 3

   Air purged

   Inspect the floats and buoyancy parts.

   Look for cracked foam, water inside a sealed chamber, or a float that has come loose. Replace worn floats with the correct part for your model.

4. 4

   Filter clear

   Check the lid and seals.

   Confirm the cover is seated evenly and gaskets are intact. Reseat or replace any seal that looks flattened or torn.

5. 5

   Flow restored

   Retest in the water.

   Resubmerge and watch whether the unit settles to the floor and begins to grip. Repeat the angled entry if it still rides high.