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Streamlines rinsing fine grit and leaves from the top-access chamber.
Dedicated Charging Dock
Upright charging station stores and recharges the 24.3-lb cleaner neatly.
Stairs, Ledges & Waterline
Covers floors, walls, tile lines, corners, and shallow tanning ledges up to 50 ft.
Maytronics One App
Full mode customization, scheduling, and status tracking.
Multi-Length Cordless Modes
Selectable cycle options tailored to light or heavy debris weeks.
3-Year Maytronics Warranty
Protected by Maytronics' top 3-year warranty tier.
The Bottom Line
Where the Dolphin EON 120d Fits
Best For
50-ft inground pools wanting Maytronics' flagship cordless EON with BackWash filtration, dock charging, and 3-year warranty.
What We’d Buy
Maytronics' flagship cordless cleaner, with a charging dock, BackWash filtration, broad pool coverage, and 3-year warranty.
Flagship Cordless or Corded?
The Dolphin EON 120d is also sold as the Nautilus EON 120D. Choose it for cable-free cleaning and dock charging. Compare the corded Dolphin Sigma, Dolphin Premier, or Clear UV if unlimited runtime and avoiding battery replacement matter more.
The Dolphin EON 120d is a cordless robotic pool cleaner from Maytronics, rated for in-ground and above-ground pools up to 50 ft long. It cleans the floor, walls, waterline, steps, ledges & corners on a 2-hour default cycle (cycle options: 1.5 h, 2 h, 2.5 h), using an active scrubbing brush.
Filtration is a backwash filter with top access. It connects to the Maytronics One app. The robot weighs 24.3 lb and carries a 3-year Maytronics warranty.
The premium robotic pool cleaner with purposeful engineering and smart design, it eliminates the daily hassle of filter cleaning and charging.
Maytronics, on the Dolphin EON 120d
Specifications
Dolphin EON 120d Specs
Product Attributes
Maximum Pool Length
50 ft
Cleaning Coverage
Floor, Walls and Waterline, Steps, Sun Ledge, Corners, Safety Ledge
Specifications as published by Maytronics for product no. 99994410-US.
FAQ, Manuals & Parts
Dolphin EON 120d FAQ & Owner Support
Frequently asked questions
Straight answers on parts, ownership, and the closest models you can order today.
Where can I check online availability for the EON 120d?
See the Dolphin Nautilus EON 120D page for current retailer pricing, or ask us to compare cordless and corded flagships for your pool.
Why doesn't my cordless robot respond to the App while underwater?
Our cordless models, the EON™ and Liberty 400/600, do not remain connected to Wi-Fi or Bluetooth while submerged and operating in the water.
After removing the robot from the water, if it was connected before, the Wi-Fi connection between the robot and the app will automatically reestablish.
To use the Maytronics One app, connect to the robot via Wi-Fi, configure your desired cleaning mode or weekly schedule (UltraRun™ Mode/Eco Mode), and then place the robot in the pool to begin the cycle. Once the robot is in the pool, it will run the selected program independently.
Our corded units allow for continuous Wi-Fi connectivity, as the connection is maintained through the power supply, which remains outside the water.
Note- The Liberty 400 pairs via Bluetooth only to the MyDolphin Plus app.
My EON™ isn't behaving properly
If your EON is not working properly, the first and most important step is to make sure your robot software is up to date.
Software updates include the latest improvements and fixes to help ensure your robot performs as expected.
Update Your EON Robot Software
Download the MaytronicsOne app and make sure Bluetooth is enabled on your smartphone.
Fully charge the robot. The battery indicator should show three solid green bars. Disconnect the robot from the charger before continuing.
Open the MaytronicsOne app, create an account or sign in, and enter the validation code sent to your email.
Press and hold the power button for 3–5 seconds to enable Bluetooth pairing. The LED will blink blue.
Follow the on-screen instructions to pair your robot. Once your robot is found, select it to begin pairing. Make sure your smartphone is not currently connected to another Bluetooth device.
Complete the software update if prompted. This step is essential.
During the update:
Stay near the robot.
Do not close the app or leave the update screen until the update is complete.
Do not interrupt the update process.
Once the software update is complete, connect the robot to 2.4 GHz Wi-Fi. You can also choose to skip Wi-Fi setup and connect later.
Once the robot is successfully connected, the LED will blink three times and then turn solid blue.
Important: Always make sure your EON is running the latest available software before continuing with additional troubleshooting.
Keeping the robot software updated ensures your EON has the latest improvements and capabilities.
How does Dolphin EON™ save you up to 20 hours per year on maintenance?
Dolphin EON™ reduces the time spent cleaning filters thanks to its patented backwash filtration technology (DebrisLock™).
Instead of cleaning the filter frequently, maintenance can be reduced to about 5 minutes once per week, helping save up to 20 hours of maintenance time per year.
DebrisLock™ technology works by:
Compressing and trapping fine particles for more efficient filtration
Providing 1-liter backwash capacity to flush debris out easily
Featuring a bottom double-opening design for quick and convenient cleaning
The DebrisLock™ backwash filter comes with EON 120d and is available as an add-on for EON 100.
What makes the EON™ 120d filtration system more advanced?
The EON 120d comes with our ultra-fine (14 micron) DebrisLock™ filter basket, with a lid that traps more debris through filtration from all directions.
The DebrisLock™ filter basket is designed for efficient debris collection and improved cleaning performance. It features 4-liter capacity, allowing it to collect more debris during each cleaning cycle. The closed chamber design helps prevent dirt and debris from returning to the pool water.
The DebrisLock™ filter basket also includes an integrated filter backwash system. This system has an extra 1-liter backwash compressed container that helps lock debris inside the filter. The backwash function operates automatically at the end of the cleaning cycle and when the filter is full to improve overall performance.
How does Dolphin EON™ deliver water that’s up to 4X clearer than competitors?
Our Dolphin EON™ features an advanced filter design that captures more debris and fine particles during each cleaning cycle. In internal 70-minute turbidity tests, the Dolphin EON™ 120d delivered water up to 4X clearer compared to other leading pool robots.
The test compared Dolphin EON™ 120d, Aiper Scuba X1 ProMax, and M400 robots. All units started with identical water turbidity levels of 7 NTU.
Our filtration advantages include:
4/5-direction filtration that captures debris from multiple angles
4–5 liter debris capacity for longer cleaning cycles
Larger filtration basket for improved debris capture
Closed chamber design that prevents dirt from returning to the water
Together, these features help deliver noticeably clearer pool water after every clean.
Troubleshooting the Dolphin EON 120d
Maytronics' own fixes for the problems owners report most, followed by the symptom table from the user manual.
Why doesn't my cordless robot respond to the App while underwater?
Our cordless models, the EON™ and Liberty 400/600, do not remain connected to Wi-Fi or Bluetooth while submerged and operating in the water.
After removing the robot from the water, if it was connected before, the Wi-Fi connection between the robot and the app will automatically reestablish.
To use the Maytronics One app, connect to the robot via Wi-Fi, configure your desired cleaning mode or weekly schedule (UltraRun™ Mode/Eco Mode), and then place the robot in the pool to begin the cycle. Once the robot is in the pool, it will run the selected program independently.
Our corded units allow for continuous Wi-Fi connectivity, as the connection is maintained through the power supply, which remains outside the water.
Note- The Liberty 400 pairs via Bluetooth only to the MyDolphin Plus app.
My EON™ isn't behaving properly
If your EON is not working properly, the first and most important step is to make sure your robot software is up to date.
Software updates include the latest improvements and fixes to help ensure your robot performs as expected.
Update Your EON Robot Software
Download the MaytronicsOne app and make sure Bluetooth is enabled on your smartphone.
Fully charge the robot. The battery indicator should show three solid green bars. Disconnect the robot from the charger before continuing.
Open the MaytronicsOne app, create an account or sign in, and enter the validation code sent to your email.
Press and hold the power button for 3–5 seconds to enable Bluetooth pairing. The LED will blink blue.
Follow the on-screen instructions to pair your robot. Once your robot is found, select it to begin pairing. Make sure your smartphone is not currently connected to another Bluetooth device.
Complete the software update if prompted. This step is essential.
During the update:
Stay near the robot.
Do not close the app or leave the update screen until the update is complete.
Do not interrupt the update process.
Once the software update is complete, connect the robot to 2.4 GHz Wi-Fi. You can also choose to skip Wi-Fi setup and connect later.
Once the robot is successfully connected, the LED will blink three times and then turn solid blue.
Important: Always make sure your EON is running the latest available software before continuing with additional troubleshooting.
Keeping the robot software updated ensures your EON has the latest improvements and capabilities.
How do I clean the impeller on the EON™ 100/120d?
Follow the steps to clean the impeller:
Remove the filter from the robot.
Connect the charger to the robot and plug it in.
As a safety measure, take a screwdriver and put it in the opening between the handle and the filter cover latch. (Do not skip this step!)
Open the filter cover door to reach the impeller opening.
How to replace the DebrisLock™ basket filter panels:
Remove the old filter panels
Open the filter cover.
Remove the filter basket from the robot.
Remove the filter lid, starting with the side that has the notch.
Remove the two longer filter panels by pushing them out from the inside of the filter basket.
Remove the two smaller side filter panels by pushing them out from the inside of the filter basket.
Install the new filter panels
Insert the smaller side filter panels from the inside of the filter basket, with the grid facing outward.
Push it into the frame until you hear a click.
Repeat with the longer filter panels, from inside the filter basket with the grid facing outward. Push it into the frame until you hear a click.
Install the filter lid, starting with the side that has a notch.
How do I use the Clicker with my cordless robot?
Use the Clicker to stop or pick up the robot! Read more to understand the differences:
Note: The Clicker is for retrieving the Dolphin Liberty 300/400/600 at the end of a cycle.
The Liberty 600 and EON™ 100/120d feature the Click-to-Stop feature, which lets you stop the robot mid-cycle.
If you want to pick up your robot:
When the cleaning cycle ends, the robot will wait at the preferred Homing wall selected in the Maytronics One app, or at a wall chosen at the beginning of the cycle if no Homing wall is set, and wait for pickup.
To retrieve the robot, shake the Clicker in the water for at least 3 to 5 seconds. The robot will climb the wall and remain there for about one minute. If it is not removed, it will go back down and wait again at another wall.
If you want to stop your robot (Liberty 600 and EON™ 100/120d):
During the cleaning cycle, shake the Clicker for 3–5 seconds to stop the robot. Make sure the robot is on the pool floor and not climbing when you shake the Clicker.
Then, shake it again, and the robot will go towards the Homing wall, provided the Homing feature has been calibrated.
Important: The robot will not respond to the Clicker while it is actively climbing. The Homing feature is also unavailable when Beach Entry is enabled in the app.
Clicker in Eco Mode/UltraRun™ Mode:
Using the Clicker in Eco/UltraRun™ Mode cancels the remaining scheduled cycles. Restart the Eco/UltraRun™ Mode before returning the robot to the pool.
While in Eco/UltraRun™ Mode, the robot can detect the Clicker for 14 days. If the Eco/UltraRun™ Mode starts with a full battery, the Clicker feature remains available for at least 2 days after the 2-week (when applicable) Eco/UltraRun™ Mode.
The Clicker is not working with my cordless robot
Note: The Clicker is for retrieving the Dolphin Liberty 300/400/600 at the end of a cycle.
The Liberty 600 and EON™ 100/120d feature the Click-to-Stop feature, which lets you stop the robot mid-cycle.
For the Liberty 600 and EON™ 100/120d, activating Beach Entry under Pool Features disables Click-to-Stop. You can still use the Clicker at the end of the cycle to bring the robot over, but it won’t stop mid-cycle. Turn off Beach Entry to re-enable Click-to-Stop.
In Eco Mode/UltraRun™, the first Clicker shake cancels the mode. The second shake calls the robot to the waterline for pickup.
Try these steps if Click Up isn’t working:
Pool filtration or circulation can create noise that blocks the Clicker signal. Turn the system off temporarily and try again.
Shake the Clicker vigorously for at least 3 seconds before use, then shake for 5 seconds while submerging it.
Make sure the robot was fully charged. If the battery was low, it may have entered Shutdown Mode. Check the LED: blinking green means enough battery; no green means it needs charging; flashing red indicates an internal error.
Shake the Clicker to check for water inside.
Fully charge the robot, let it finish a full cycle, then try the Clicker again, shaking it strongly and submerging it in water deep enough.
This can also occur if the pool or ground surface has steep slopes.
Still need assistance? Click the blue chat icon in the bottom-right corner of your screen to start a conversation with our AI agent — 'Phin'!
Symptom
Possible reason
What to do
tom
Possible reason
Corrective action
pair the ics OneTM app to tic pool cleaner.
• The Bluetooth® on one of your devices is either OFF or not in pairing mode. • The mobile phone is too far from the robot. • Mobile phone location is OFF. You did not give the required permissions when installing the app. • Battery is too low.
• Turn the Bluetooth® OFF and on in your smartphone. For iOS – Go to settings → Bluetooth®. • Get closer to the robot. • Turn mobile phone location ON • Fully charge the robot • Check that the robot's charger is connected well and that your mobile phone's Bluetooth® is searching for nearby devices. • Try uninstalling and reinstalling the Maytronics OneTM app, and give all permissions. If it still doesn't find your robot, try restarting your mobile phone. • If none of the above troubleshooting helps, contact wecare@maytronics.com
Fi® doesn't stay ed. It works via th® when near t, but loses equently.
• The Wi-Fi® router alternates between 2.4 and 5 GHz frequencies causing disconnection when the 2.4 one is lost. • The Wi-Fi® signal is too weak to maintain a connection.
• The device connects only to the standard 2.4 GHz Wi-Fi® frequency. If you have a dual or quad band router, to prevent connectivity issues, split and give separate names to the 2.4 and 5GHz networks. Consult your internet provider or see online instructions for your specific router brand. • If the signal near the power supply is not strong enough to easily stream an online video, consider installing a 2.4GHz Wi-Fi® extender.
From the Dolphin EON 120d user manual's troubleshooting table.
This model next to the three ProLine™, Max-Series™ and Clear™ robots closest to its price. Use the dropdowns to put any robot in a column: every Dolphin line, the Clear™ Series, and the other brands we carry.
