Dolphin power supply 4 blinks

dolphin

Double-check before purchasing

The exact meaning of 4 blinks varies between Dolphin PSU generations — some models use different blink sequences to indicate the same fault. Consult your model-specific documentation.
A 4-blink code on older PSU models may have a different meaning than on current Maytronics units.

The Problem

Four blinks on a Dolphin power supply LED typically indicates a drive motor fault or a motor overload condition. The PSU has detected an abnormal current draw consistent with a seized or overloaded drive motor, and has shut down to protect the circuit.

Steps

1
Remove the robot from the pool. Flip it over and spin each track by hand. All tracks should rotate freely with no grinding or resistance.
2
Spin the impeller by hand — it should turn freely in both directions. Clear any blockage.
3
Inspect the drive belts. Replace any that are broken, cracked, or slack.
4
Perform a full reset: unplug the PSU, disconnect the cable, wait 90 seconds, reconnect, and retry.
💡 A one-off motor stall can sometimes trigger this code without an ongoing fault.
5
Test the PSU with no cable attached. If it still shows 4 blinks with no cable, the fault may be internal to the PSU rather than the motor.
6
If all mechanical components are clear and the fault persists, contact Maytronics support with your model number and the 4-blink code.

Possible Causes & Solutions

common

Drive track or impeller jammed, causing motor to stall

Remove the robot from the pool and flip it over. Spin both tracks and the impeller by hand — all should rotate freely. Clear any debris, hair, or stones causing resistance.

occasional

Drive belt slipped or broken, causing motor to spin without load and then overcurrent

Inspect the drive belts connecting the motors to the tracks. A broken belt can cause the motor to run unloaded initially and then encounter a sudden load, triggering overcurrent protection.

occasional

Water ingress into a motor housing causing increased resistance

If a motor seal has failed, water inside the motor housing increases resistance dramatically. The motor draws excess current and the PSU shuts down. Inspect seals and contact Maytronics service.

rare

Failing drive motor drawing excess current

If all mechanical components are clear and move freely, one of the drive motors may be failing internally. This requires professional diagnosis.

When to Replace

Replace drive belts if broken. Motor replacement requires a Maytronics service centre. Replace the PSU only if it blinks 4 times with no cable attached and after confirming the robot hardware is fault-free.

Where to Buy

Find compatible replacement parts from these retailers:

Check price for dolphin replacement parts on Amazon

Compatible Parts

Drive Belt Kit

Model-specific. Confirm compatibility before ordering.

Maytronics Dolphin Power Supply Unit

Confirm your model number before ordering a replacement PSU.

Frequently Asked Questions

What does 4 blinks on a Dolphin PSU mean?

Four blinks typically indicates a drive motor fault or motor overload condition. The PSU has detected abnormal current from a motor or drive component. Start by checking the tracks and impeller for mechanical obstructions.

Is 4 blinks worse than 3 blinks?

They indicate different faults. Three blinks is typically an overcurrent condition (often cable or connection related), while four blinks points more specifically toward a drive motor or mechanical blockage.

Can I fix a 4-blink error myself?

Clearing mechanical blockages from the tracks and impeller is a straightforward DIY fix. Motor and internal PSU faults require professional diagnosis.