12 fixes from Maytronics support and the Liberty 300 user manual, sorted by what the robot is doing wrong, each with the genuine part that fixes it. Start with the checks at the top: they solve most calls before anything is replaced.
A cordless robot that will not start is almost always a charging problem. Rule that out first. Where a check ends in a worn part, the genuine replacement is linked under it.
1Charge it fully before anything else
A full charge shows three solid green bars and can take up to six hours. Charge in the shade; a hot robot charges slowly or not at all.
My Dolphin Liberty doesn't complete the cycle, with red LED on the power unit
The Liberty 200 & 300 manufactured from 2024 onwards, have a 120 minute cycle time. The Liberty 200 & 300 manufactured before 2024 have a 90 minute cycle time.
Try the following troubleshooting steps:
Clean the filter cartridges.
How to clean the filters
Check the tracks to see if any debris is stuck there.
How to clean the tracks
Make sure the robot is unplugged, turn the robot upside down, and check the tracks and brushes for any obstructions or visible damage.
Charge the robot for a full charging cycle, until the power unit LED shows 3 steady LEDs.
For the Liberty 300/400/600, verify that the Eco Mode is not set. To cancel the Eco Mode, take the robot out of the pool and connect it to the charger.
Why can’t I access all of the features on my Liberty power unit?
The Power Unit is the controller for the Liberty 200, 300, and 400 robotic cleaners. The Liberty 400 comes with the MyDolphinPlus app.
Your Dolphin Liberty is programmed with specific features according to the model. the user manual to refer to the user manual to see the features available with your robot model.
Cycle selector is not working on Dolphin Liberty 300 and 400Liberty 300
Make sure that the Cycle Selector feature is activated correctly:
Press the Power (ON) button. After the battery LED lights up, press and hold the Power (ON) button for 3-6 seconds.
Let go of the Power (ON) button when the purple LED blinks 3 times. Place the robot in the pool, and it is supposed to start working within 30 seconds.
If you notice that your Dolphin Liberty has difficulty climbing the walls, try the following troubleshooting steps:
Check that the filters are not dirty or clogged (although the filters may look clean, small particles may dry on the material and clog it). It is recommended to clean the filter cartridges after each use, but a deeper cleaning may be required.
How to clean the filter basket
Ensure that the filter panels in the basket are properly installed, tightly fitted, with no visible gaps, and that the filter panels are properly clipped to the bracket.
If the Dolphin still does not climb the walls, please remove the filter basket and run the robot for 10-15 minutes for testing purposes only.
Caution: Make sure there isn't any hard and/or sharp debris in the pool that can damage the robot impeller (which will no longer have the filter during the test).
If the Dolphin climbs without the filters, then the filters are due to be replaced.
Verify that the chemicals are balanced, this is essential for the best results from your Dolphin. Make sure that the water in your pool is balanced and free of algae.
If your Dolphin tries to climb but slips on the wall, try brushing the wall with a broom until the biofilm is removed. If necessary, rebalance your pool water. to shop our pool chemicals
It is important to ensure that the pool temperature levels are within our recommended usage range: 43°–95°F. Low temperatures can make it difficult for the robot to climb.
Parts that fix thisGenuine Maytronics parts that fit the Liberty 300.
Why doesn't my cordless robot respond to the App while underwater?Most common
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.
Why can't I pair my cordless robot with the Maytronics One app?
The Maytronics One app is currently available for the EON 100, 120d, and Liberty 600 only.
If you’re having trouble connecting your cordless robot to the Maytronics One app, try the following steps:
Check Bluetooth settings: Make sure Bluetooth is turned ON on your smartphone and that it is not connected to another device.
o On iOS: Go to Settings > Bluetooth.
Check the Wi-Fi name and password: Make sure the network name and password is less than 32 characters, without spaces and special characters (i.e., # % & " $ ￡)
Move closer to the robot: Keep your phone close to the robot during pairing and make sure the robot is in pairing mode (connectivity LED is blinking blue).
Enable location services: Ensure location services are turned ON for your phone, as they are required for Bluetooth pairing.
Fully charge the robot: A low battery can prevent pairing. Charge the robot fully before trying again.
Confirm the robot is charging properly: Make sure the charger is securely connected and that your phone is actively searching for nearby Bluetooth devices.
Reinstall the app if needed: Uninstall and reinstall the Maytronics One app, and be sure to allow all requested permissions during setup.
Restart your phone: If the robot still isn’t found, restart your smartphone and try pairing again.
Note: Up to 10 devices can be recognized via Bluetooth (one user can connect at a time via Bluetooth), up to 5 users can connect via Wi-Fi.
Why doesn't the Wi-Fi stay connected to the Maytronics One app?
The robot does not stay connected to Wi-Fi or Bluetooth while operating in the water.
After removing the robot from the water, if it was connected before, the connection between the robot and the app will automatically reestablish.
If you’re having trouble with your cordless robot staying connected to the Maytronics One app, try the following steps:
Remove the robot from the water.
Re-establish the connection by pressing the power button or connecting the robot to the charger. For best results, charge the robot to at least 50% (until the second battery level bar) before attempting to connect.
Confirm your router is set to 2.4 GHz Wi-Fi only.
If using a dual-band router, we recommend splitting the networks and assigning separate names to the 2.4 GHz and 5 GHz networks to differentiate between the two.
Make sure the Wi-Fi signal is strong near the charging location. If needed, consult your internet provider about installing a 2.4 GHz Wi-Fi extender.
Open the app and reconnect the robot once it is charging.
If multiple users are connected, unpair extra users in the app settings and try again.
Note: Up to 10 devices can be recognized via Bluetooth (one user can connect at a time via Bluetooth), and up to 5 users can connect via Wi-Fi.
Eco Mode is included with the Dolphin Liberty 200 (manufactured in 2024 onwards), 300 and 400.
Make sure that the Eco Mode feature is activated correctly:
Press the Power (ON) button to activate the feature until the LED lights up.
Press the Power (ON) button again for more than 6 seconds (ignore the blinking purple LED, continue pushing the Power button).
Stop pressing the Power (ON) button when the green LED blinks 3 times (this means it has been programmed). Place the robot in the pool, and it is supposed to start working within 30 seconds.
If you see the robot worked only 1-2 times over the week (and not 3 times, as programmed), this means that the initial battery state was not full. Make sure to program the Eco Mode (weekly timer function) with a full battery.
For Liberty 300 and 400, if you see that the robot is not climbing and working for more than 30 minutes, this means that the Cycle Selector was set instead.
To make sure that you have activated the Eco Mode, it is important to ignore the blinking purple LED lights and to continue pushing the button until you see the LED blinking green.
To cancel the Eco Mode, take the robot out of the pool and connect it to the charger.
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.
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.
Confirm 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.
The troubleshooting table printed in the Liberty 300 manual, one card per symptom. A part named here is in the parts list below.
MyDolphin™ Plus troubleshooting
Cannot pair the MyDolphin™ Plus app to the robotic pool cleaner.
Likely cause
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.
What to do
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
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 MyDolphinTM Plus 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 Maytronics customer care
Robot is not waiting at the waterline when I arrived. It is standing near a wall.
Likely cause
It waits for a few seconds and then climbs another wall. After climbing 3 walls, it will wait by the wall to prevent running out of energy.
What to do
Shake the Clicker in the water for 3 seconds and it should climb up. Clickup will work for 2 days after the end of the robot's cycle.
Connect the provided hook to your cleaning pole, and lift the pool cleaner to the waterline with the hook. At the water line pull the robot out.
ROBOTIC POOL CLEANER troubleshooting
The robot does NOT start.
Likely cause
An object is stuck in the tracks or wheels.
An object or hair is stuck in the impeller.
The robot is not fully charged.
The robot is out of the water.
The red error indicator LED is ON.
What to do
Carefully remove the object from tracks or wheels.
Clean the impeller (see section 7.1).
Charge the battery to 100% -3 green bars.
Place the robot in the water within 30 seconds after starting it.
If LIBERTY 400, check app for error message and troubleshooting.
If none of the above troubleshooting helps, contact Maytronics customer care
The robot is moving in circles.
Likely cause
Clogged filter basket.
Debris stuck in the impeller housing or impeller cover.
An object is stuck in the tracks or wheels.
The pool's surface is too glossy for this robot model.
Algae buildup or pool water does not meet specifications.
What to do
Clean the filter basket. It should be white and clean when touching. If it is brown or green, clean it with a hose. If it stays brown, it may be time for a replacement filter.
Clean the impeller (see section 7.1).
Carefully remove the object from tracks or wheels.
Correct pool and water conditions.
The robot doesn't charge properly.
Likely cause
The wall power outlet isn't working.
An object or dirt is preventing a proper magnetic connection between the charger and the robot.
The robot is too hot or cold to be charged properly
It hasn't charged for enough time
What to do
Test the power outlet with another device or try charging the robot from an outlet that works.
Make sure that the charger connections are clean on the robot and magnetic, inductive charger.
Charge in the shade or indoors. If summer, try charging at night.
It can take up to 6 hours for a full charge.
The robot does not turn or moves in one direction only.
Likely cause
Debris stuck in the impeller housing or impeller cover.
What to do
Clean the impeller.
The robot moves but does not clean the pool.
Likely cause
Clogged filter basket.
Debris stuck in the impeller housing or impeller cover.
What to do
Clean the filter basket. It should be white. If it is brown or green, clean it with a hose.
Clean the impeller.
The robot does not climb up the walls.
Likely cause
The filter is too full to allow proper jet propulsion up the wall.
Debris is stuck in the impeller housing.
The pool surface is too slippery.
Algae on walls.
Unsuitable pH level.
What to do
Clean the filter and make sure that there is nothing stuck in the impeller. The filter should be white. If it is brown or green, clean it with a hose.
Clean the impeller.
Check the level of chemicals in the water. Improper levels may allow the growth of algae, making the walls slippery. If so, adjust the levels and scrub the walls.
Replacement parts
19 genuine parts that fit the Liberty 300.
Worn filters, brushes and tracks cause most of the problems above. These are the genuine parts Maytronics lists for model 99998130-US; each one opens with its price and fitting notes.
If the checks above did not fix it, the robot may need a repair. Under warranty, Maytronics handles power supplies by replacement and robots through its repair centers; have the serial number from the label under the handle ready.
