Confirm the expected brush action
Review the parts diagram and product manual. A passive roller may turn only through contact with the floor, and an active brush may pause during turns or selected modes. Comparing it with a different family can create a false fault report.
Observe without physical contact
From the deck, watch brush contact through clear water or inspect the cleaning pattern after the cycle. Never enter the pool with the robot energized and do not hold the machine while starting it. Use an official diagnostic procedure if one exists.
Remove wrapped material safely
Switch off and disconnect the power supply, or place a cordless model into its documented safe maintenance state. Remove hair, thread, palm fibers, and bands from the accessible brush ends. Wear gloves for sharp debris and avoid hidden impeller or gear openings.
Inspect serviceable transmission parts
Some designs use a visible belt or coupling that owners can replace. Check for missing teeth, misalignment, cracking, or a brush installed backward. Use the exact replacement and route it as shown; excessive tension can damage shafts and motor bearings.
Stop when the drive is internal
A brush that remains locked after cleaning, spins on only one side, or produces grinding, burning odor, leakage, or error codes may have a motor or gearbox issue. Do not open a sealed housing. Record a video and contact an authorized repair channel.
Use the robotic pool cleaner decision framework to compare the broader category, or narrow the catalog through Robotic Pool Cleaners for In-Ground Pools.
Exact products to compare
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Dolphin Nautilus CC Automatic Robotic Pool Cleaner
Best for: Owners who want a compact established corded cleaner
Dolphin Nautilus CC Plus Robotic Pool Cleaner
Best for: Buyers comparing a widely searched midrange Dolphin
Dolphin Nautilus CC Supreme Wi-Fi Robotic Pool Cleaner
Best for: Large pools needing broader cleaning-zone coverage
Frequently asked questions
Should brushes spin when the robot is out of water?
Not necessarily, and dry operation may damage a water-cooled unit. Use only a manufacturer-approved test.
Can worn brushes still rotate?
Yes. Rotation does not prove good floor contact. Replace material that has reached the documented wear condition.
Why does one brush stop intermittently?
Entanglement, a slipping belt, mode behavior, or a drive fault may be responsible. Isolate power before inspection.
Final decision
Match the answer above to the exact model manual, pool measurements and maintenance routine. Amazon listings can change by seller, bundle and generation, so verify the product name and ASIN before relying on a feature.