A pool robot floating at launch may still contain trapped air or need its specified brush preparation. It may also be a surface cleaner that is supposed to float. Identify the model and intended behavior before trying to force it down.
For a floor cleaning robot, follow its documented launch method with the filter correctly installed. Do not remove factory foam, add weights, or hold the machine underwater while it runs. Those changes can create a balance problem without solving the original cause.
Decide whether floating is abnormal
Check the cleaner’s purpose and current operating stage. A robotic surface skimmer works at the waterline. Some other robots use a retrieval or parking behavior that differs from their cleaning movement.
| What you are observing | First question | Direction |
|---|---|---|
| Surface skimmer traveling across the pool | Is surface cleaning its intended job? | Review robotic skimmer operation |
| Floor robot floating immediately after placement | Has it completed the prescribed launch preparation? | Check trapped air and brush requirements |
| Cleaner rises only for retrieval | Is a parking or collection feature active? | Read that mode’s behavior |
| Robot tips onto one side repeatedly | Did a part or balance condition change? | Inspect fit and recent service |
| Machine settles, then stops without cleaning | Did a fault or wrong mode interrupt startup? | Follow cycle and startup observations |
A photo of the floating machine is useful, but a short video from placement to the problem is better. Record whether it is level, nose high, or tipped to one side. Note whether bubbles continue to leave it.
Let air escape through the prescribed method
A cleaner entering water has spaces that must fill or vent before it settles as designed. Filters and body openings affect that process. Use the orientation and sequence shown in the exact manual.
Some instructions call for gentle rocking or a particular immersion angle. Others specify brush soaking before startup. Do not assume that turning every robot upside down is the correct purge method.
Keep your hands away from moving parts and follow the model’s power sequence. Do not press the robot down with a pole or stand in the pool beside it. Retrieve and restart correctly if the launch did not work.
If the cleaner sinks normally after the prescribed preparation, record that result. It points toward launch preparation rather than a need for heavier parts. Repeated failure under the correct procedure deserves another check.
Check whether the brushes need soaking
Certain sponge like climbing materials need to absorb water before normal operation. Maytronics’ cited troubleshooting manual specifically identifies soaking Wonder or combined brushes when the robot does not sink. That instruction does not apply to every brush design.
This can matter after storage or replacement. A cleaner that worked last season but floats on its first launch may not have completed the required preparation. Check the brush identity rather than assuming the material is defective.
Do not remove or trim a ring because it appears too buoyant. Confirm that the brush or climbing ring is the correct part for that model. A replacement that looks similar can still change fit or balance.
The robot storage guide provides the broader restart context. Follow the manufacturer’s permitted soaking method; do not use heat, solvents, or detergents to make the material wet faster.
Recheck the filter assembly
With the robot safely off and out of the pool, remove and inspect its filter. Confirm that a bag is arranged correctly or that basket panels and latches sit where intended. Clear loose debris from accessible openings without modifying them.
Make sure no packaging, cleaning cloth, or improvised insert has been left inside. Check the manual before removing any foam or plastic component. Factory buoyancy pieces can resemble disposable packing material.
Reassemble the cleaner completely before another launch. Do not treat running without the normal filter as a universal diagnostic. A manufacturer may allow a specific short test under particular conditions, but that permission is model dependent.
Use the filter cleaning procedure when deposits or loading interfere with normal operation. If the issue began immediately after fitting a new basket, verify its part number and seating before changing anything else.
Review what changed before the problem started
List recent cable, brush, track, basket, and body repairs. On a corded robot, inspect the cable arrangement and any specified floats. A cable snag or incorrect assembly can pull the cleaner sideways rather than simply preventing it from sinking.
Compare the current arrangement with the exact parts diagram or service instructions. Do not combine floats from different cable kits because an online comment says the older ones worked. Get the correct configuration confirmed for your robot.
If the cable is tight or badly coiled, follow cable routing checks. If the cleaner stays level on open floor but tips only at a stair, use step trapping diagnosis. Those patterns are more specific than saying the robot has too much buoyancy.
An unexplained change after impact or housing damage needs service. Do not drill a shell to release air or open a sealed motor compartment. Those actions can compromise parts intended to remain sealed.
Confirm water depth and operating conditions
Check that the launch area satisfies the model’s minimum water depth and other operating limits. A shallow ledge can leave a robot partly exposed even when the main pool is deep enough. Wall or step capability is also model specific.
Keep general operating depth separate from any special shallow surface feature. For example, the LIBERTY 600 manual describes step cleaning and separately lists its normal depth range. Do not transfer either specification to a different Dolphin.
Water treatment conditions matter too. Do not launch during an incompatible chemical treatment merely to test sinking. Restore appropriate pool conditions and follow both the chemical and cleaner instructions before retrying.
Use the next launch as a controlled check
Consider an illustrative case: a robot fitted with new absorbent climbing rings floats level after placement. After the manual’s brush preparation, it settles and cleans normally with no other changes. That supports incomplete preparation as the explanation.
Now consider a robot that tips left after a replacement cable was fitted. Extra soaking does not change it, and the cable visibly pulls that side. That observation calls for checking the cable assembly and balance configuration rather than adding ballast.
For your own record, note the preparation performed, water depth, filter configuration, and any recent parts. Observe the full transition to normal cleaning. Sinking alone is not success if the robot then moves abnormally or stops.
If the correct preparation and assembly do not resolve it, send that record and video to support. Ask for a model specific assessment of the observed balance or launch behavior. A weight added to make the machine disappear below the surface would conceal the problem instead of establishing a safe repair.
