Watch one supervised approach
Run the cleaner with clear water visibility and note which edge, wheel, brush, or cable contacts the obstacle. Do not enter the pool with powered equipment operating. A short video from the deck can help support distinguish a high-center problem from cable tension or poor traction.
Remove nonessential obstructions
Take out loose toys, thermometers, automatic-cleaner hoses, and removable ladders only when normal pool procedures permit. Secure covers and accessories according to their instructions. Never move, block, or modify a main drain while the circulation system is operating.
Restore grip and balance
Rinse slippery film from tracks, wheels, and brushes, then inspect user-replaceable traction parts for wear or stretching. Empty an overloaded basket and reinstall it correctly. A tilted or buoyant chassis can hang on a fitting that a balanced robot would cross.
Review route controls
Some models offer alternate cycle modes or documented settings for drains and complex shapes. A different starting location may also change the approach angle. Avoid tying weights, foam, or homemade deflectors to the robot because they can alter sealing, motor load, and electrical safety.
Seek a compatible engineered solution
If the same approved drain cover repeatedly captures the cleaner, give the pool and cleaner model numbers to both manufacturers or a qualified pool professional. Stop using the robot if it damages the drain cover, exposes a sharp edge, jams a safety component, or cannot be freed without entering unsafe conditions.
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
Can I place a mat over the main drain?
No improvised covering is appropriate. Drain systems are safety-critical and must retain approved flow and anti-entrapment protection.
Will a different starting point solve the problem?
It may change the route, but it is not a reliable fix if geometry consistently traps the unit. Supervise the test.
Do worn tracks cause corner sticking?
They can reduce the grip needed to reverse or climb away. Compare their condition with the replacement criteria in the manual.
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.