Troubleshooting · Troubleshooting
Why is the cycle selector not working on Dolphin Liberty 300 and 400?
Short answer: Turn the robot on, hold Power (ON) for 3-6 seconds after the battery LED lights up, then release when the purple LED blinks 3 times.
Try activating the Cycle Selector again: press Power (ON), wait for the battery LED, then hold Power (ON) for 3-6 seconds and release when the purple LED blinks 3 times.
Based on Maytronics support, updated 2026-04-26, rewritten by Poolbots' pool experts. Applies to 1 model.
The fix
Step by step.
On Dolphin Liberty 300, use this sequence to activate the Cycle Selector.
-
Step 1Turn on the robot and hold the power button
Turn the robot on by pressing the Power (ON) button. Once the battery LED is lit, press and hold the Power (ON) button for 3-6 seconds.
-
Step 2Release the button and put the robot in the pool
Release the Power (ON) button when you see the purple LED blink 3 times. Put the robot in the pool. It should begin cleaning within 30 seconds.
Source: Maytronics support. Same steps and facts, rewritten for clarity; the videos and illustrations are Maytronics' own.
By model
This fix on your robot.
Every model below has its own troubleshooting guide that repeats this fix with the exact parts that fit it. The link opens the guide on this fix.
Still need help?
