Dolphin robot not moving

dolphin

Double-check before purchasing

Factory reset procedure varies between Dolphin models — check your model's manual.

The Problem

A Dolphin that powers on but won't move — or fails to start — is almost always caused by a power supply fault, a tangled cable, or a blocked impeller triggering the overload shutoff. Check the power supply indicator light first. It tells you most of what you need to know before touching the robot.

Steps

1
Check the power supply indicator light before anything else. Solid green = power OK. Blinking = fault detected. No light = no mains power reaching the PSU.
2
Disconnect the robot from the PSU and lay the full length of cable out flat. Check for sharp kinks, cuts, or twisting — particularly near the connector at the robot end.
3
Remove the robot from the pool. Open the filter compartment and spin the impeller by hand. It should spin freely. If stuck, clear the blockage.
💡 Use a thin flat-head screwdriver or stiff brush to dislodge compacted debris from around the impeller blades.
4
Spin each drive wheel by hand. Both should turn with similar resistance. If one is seized, there is a motor or belt issue on that side.
5
Test the PSU on a different mains outlet to rule out a tripped breaker or supply issue.
6
Perform a factory reset following the procedure in your model's manual or the Dolphin app.
7
Inspect the swivel cable connector at the robot end for corrosion, bent pins, or debris in the socket. Clean gently with a dry cloth or compressed air.

Possible Causes & Solutions

common

Power supply fault or overload shutoff

Check the indicator light on the power supply unit. A blinking light means the PSU has detected a fault and cut output. Disconnect everything for 5 minutes, then retry.

common

Tangled or kinked cable

Lay the full cable out flat before placing the robot in the pool. A tightly kinked cable can restrict the robot's movement and, in some models, trigger a cable-protection response.

occasional

Blocked impeller

Remove the robot from the pool, open the filter compartment, and check the impeller for leaves, hair, or debris. Spin it by hand — it should rotate freely with light resistance.

occasional

Drive motor issue

If the impeller spins freely but drive wheels do not turn, there may be a drive motor or belt issue. Check the belt before assuming motor failure.

rare

Water ingress into motor housing

Inspect seals around the motor access panels. Signs of water ingress include visible moisture or a burning smell after use. Contact a Maytronics service centre if suspected.

rare

Robot in scheduled or standby mode

Check the Dolphin app — the robot may be set to a scheduled start time or paused. Check connectivity and mode status in the app before assuming a hardware fault.

When to Replace

Replace the power supply if the reset procedure does not clear a confirmed fault and the cable and robot have been checked. Replace drive components when mechanically confirmed as seized or failed. Replace the cable if insulation is cracked or connector pins are corroded.

Where to Buy

Find compatible replacement parts from these retailers:

Check price for dolphin replacement parts on Amazon

Compatible Parts

Maytronics Dolphin power supply unit

PSU variants differ between Dolphin product lines. Check the label on your existing unit and match the model reference before ordering.

Swivel cable connector

Available as a standalone replacement for most Dolphin cable assemblies.

Drive motor unit

Motor specifications are model-specific. Confirm the correct part using your robot's model label before ordering.

Full cable assembly

Available in different lengths depending on your model. Confirm the correct cable length for your robot before ordering.

Frequently Asked Questions

The robot runs for a few seconds then stops. What is causing this?

This is typically the overload protection shutoff. The PSU detects excessive current draw — usually from a blocked impeller or seized drive wheel — and cuts power. Clear the blockage first.

The PSU light is solid green but the robot still won't move.

The fault is in the cable or robot, not the PSU. Inspect the swivel connector at the robot end for corrosion or bent pins, then check the drive wheels and belt directly.

Can I repair a Dolphin drive motor myself?

Drive motor replacement is achievable for confident DIYers with the correct model-specific parts and a seal kit. Improper seal replacement can cause water ingress. If in doubt, use a Maytronics-authorised service centre.