Why Is My Robotic Pool Cleaner Not Working? (Fix It First)
Work through these 5 steps before calling a repair shop.
Start Here: 5 Most Common Problems
Before calling a repair shop, work through these in order. Over 80% of "dead" pool robots are fixed by one of these steps.
A full filter basket restricts water flow through the robot, which triggers automatic shutoff in most modern units. The robot may stop mid-cycle, move erratically, or refuse to start.
Fix: Empty and rinse the filter basket. If the basket is clean, soak the cartridge media in filter cleaner for 10–15 minutes to remove oils and fine particles.
A severely kinked cord can interrupt power to the robot mid-cycle. Swivel cords on premium models help prevent this, but any cord can develop memory kinks over time.
Fix: Lay the cord out flat in the sun for 30 minutes to relax the kinks. Store the cord loosely coiled — never wrapped tightly around the power supply.
Hair, string, and leaves wrap around the brush axle and drive track wheels. If the robot is "moving in circles," "not climbing walls," or "getting stuck," this is likely the cause.
Fix: Remove the robot and inspect the brush roll and drive track axles. Use scissors to cut away wrapped hair/string. Do this every week during heavy-use season.
The power supply box (the brick on the cord) takes a lot of abuse. Check whether the indicator light is on. If not, test with a different outlet. GFCI outlets trip frequently near pools.
Fix: Reset the GFCI outlet. Test a different outlet. Check cord connections at both the power supply and the robot itself.
Dolphin robots occasionally need a factory reset after software updates or power interruptions. Symptoms: erratic movement, not following walls, cleaning the same area repeatedly.
Fix: Hold the power button for 10+ seconds to factory reset. Consult your model's manual for the exact reset procedure.
When to Call for Service
If all five of the above checks come up clean and the robot is still non-functional, the issue is likely a motor, circuit board, or seal failure. At that point:
- If under warranty: contact the manufacturer directly — Dolphin, Polaris, and Hayward all have US service networks
- If out of warranty: get a repair quote, then compare to replacement cost. If the repair is more than 40–50% of a new unit, replace it.