A robot that shuts down minutes into a cycle is almost always tripping a protective cutoff — the trick is finding which one. If it will not start at all, see why your pool robot won't turn on.
Power Supply and GFCI
Start at the wall. A tripping GFCI outlet or a hot, overheating power supply will cut the robot off repeatedly. Plug the power brick into a properly grounded outlet, keep it out of direct sun and off hot concrete, and make sure it has airflow. Never run a robot's power supply on a cheap extension cord — voltage drop causes exactly this kind of shutdown.
Overheating from Blockages
If the impeller or drive motor is straining against jammed debris, the robot draws extra current and trips its thermal protection. Clear the impeller and remove anything wrapped around the tracks and brushes. Also rinse a clogged filter, which forces the motor to work harder.
Water and Connection Faults
A nicked cord, corroded connector, or water intrusion into the power supply can cause intermittent cutoffs. Inspect the full length of the cord and the plug connections for damage; replace worn parts from our parts page.
When to Replace
If the power supply and drive train are clean and the robot still quits, the motor or control board may be failing — common on aging units. A reliable corded model like the Dolphin Sigma runs full cycles without drama; see our best robotic pool cleaners picks.
