Dolphin power supply 5 blinks

dolphin

Double-check before purchasing

5-blink codes vary significantly between Dolphin PSU models and generations. This guide describes the most common interpretation — consult Maytronics support for your specific model.
Do not attempt to open or service the power supply unit internally — internal capacitors hold dangerous charge even when unplugged.

The Problem

Five blinks on a Dolphin power supply LED typically indicates a high-level internal fault — often a PSU component failure or a serious robot electrical fault. A 5-blink code is less likely to be resolved by field repair than 2 or 3 blink codes and usually requires professional service or PSU replacement.

Steps

1
Perform a full reset: unplug the PSU from the wall, disconnect the cable, wait 90 seconds, reconnect. A single transient fault can sometimes produce this code.
2
Test the PSU with no cable attached. Observe the blink pattern with nothing connected.
💡 Steady light with no cable = PSU is OK, fault is in cable or robot. 5 blinks with no cable = PSU has internal fault.
3
If the PSU tests clean without the cable, connect only the cable without placing the robot in water. If 5 blinks return, the fault is in the cable.
4
Inspect the full cable length for visible damage, cuts, or heat exposure.
5
If all of the above tests are inconclusive, contact Maytronics support with your model number and the blink code before purchasing parts.

Possible Causes & Solutions

common

Internal PSU component failure

Test the PSU with no cable attached. If it shows 5 blinks with nothing connected, the fault is internal to the PSU and the unit needs replacement.

occasional

Robot internal electrical fault (control board or motor failure)

If the PSU shows a steady light with no cable but 5 blinks when connected, the fault is in the cable or robot. Inspect the cable first; if clean, the robot electronics need professional diagnosis.

occasional

Cable with severe internal damage causing a complex fault

A heavily damaged cable with multiple internal breaks or a partial short can generate unusual blink codes. Try a different cable if one is available to isolate the fault.

When to Replace

A PSU that produces 5 blinks with no cable attached should be replaced. Do not attempt to open or repair the PSU yourself — internal capacitors carry dangerous charge.

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

Model-specific. Verify your model number before ordering.

Full Cable Assembly

Confirm cable length (10m or 18m) before ordering.

Frequently Asked Questions

Is 5 blinks a serious fault on a Dolphin PSU?

Yes. Five blinks typically indicates a more serious fault than 2 or 3 blinks. Start by testing the PSU standalone (no cable) to determine whether the fault is in the PSU itself or downstream.

Can I fix a 5-blink error myself?

DIY fixes are limited to cable inspection and replacement. An internal PSU fault or robot electrical fault at this code level typically requires professional service or PSU replacement.

How do I know if the PSU or the robot is at fault?

Connect the PSU with no cable. A steady light means the PSU is working — the fault is in the cable or robot. Five blinks with nothing connected means the PSU itself has failed.