Dolphin power supply 2 blinks

dolphin

Double-check before purchasing

PSU blink code meanings vary between hardware revisions — verify against your specific PSU model documentation.

The Problem

Two blinks on a Dolphin power supply LED typically signals a cable connection or motor circuit fault. On most Maytronics PSU units, two blinks indicate the PSU has detected a problem between itself and the robot. The fix is often as simple as cleaning and reseating the cable connector.

Steps

1
Unplug the PSU from the wall. Disconnect the floating cable and inspect both connector ends for corrosion, bent pins, or moisture.
2
Clean the connector pins with a dry cloth. If corrosion is visible, use contact cleaner spray and allow to dry completely before reconnecting.
3
Reconnect the cable to the PSU firmly. You should feel it seat securely.
4
Plug the PSU back in. If it still blinks twice, perform a full reset: disconnect both the wall plug and the cable for 90 seconds, then reconnect.
5
Test the PSU without any cable attached. A steady light with no cable means the fault is in the cable or robot. Continued blinking with no cable means the PSU itself has a fault.
💡 This single test isolates whether the fault is the PSU, cable, or robot.
6
If the fault is in the cable, inspect the full length for damage or compromised insulation. Replace if internal damage is suspected.

Possible Causes & Solutions

common

Floating cable not fully seated in the PSU connector

Disconnect and firmly reconnect the cable to the PSU. You should feel the connector click or seat fully. A loose connection is a common trigger for this error.

common

Corroded, bent, or dirty pins on the cable connector

Inspect both connector ends for green corrosion, bent pins, or moisture. Clean with a dry cloth or contact cleaner spray and let dry before reconnecting.

occasional

Water ingress into the cable connector causing a partial short

Moisture on the connector pins can trigger this error. Dry the connector thoroughly and store it with a protective cap when not in use.

occasional

Break or short in the floating cable

Inspect the cable jacket for cuts or damage. Internal breaks cause the PSU to detect a fault in the robot circuit. A cable with internal damage will need replacement.

rare

Motor inside the robot drawing abnormal current

If the cable and connector are both clean and sound, a failing motor may be drawing excess current. This requires professional diagnosis.

When to Replace

If the 2-blink error only appears with the cable connected and the cable shows no visible damage, internal cable damage is likely — replace the cable. If the PSU blinks without any cable attached, the PSU itself needs replacement.

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. Confirm your Dolphin model number before ordering.

Full Cable Assembly

Available in 18m and 10m lengths. Confirm your model's cable length before ordering.

Replacement Swivel Cable Connector

Fits most Dolphin cable assemblies. Available standalone.

Frequently Asked Questions

Are Dolphin PSU blink codes the same across all models?

Blink codes can vary between PSU hardware generations and models. Two blinks generally indicates a cable or motor circuit fault, but check your specific PSU manual for exact definitions.

Can moisture in the connector cause a 2-blink error?

Yes. Even small amounts of moisture on the pins trigger this error. Dry the connector thoroughly and store it with a protective cap when the robot is not in use.

Should I replace the cable or the PSU first?

Test the PSU without any cable attached. If it shows a normal indicator light with no cable, the PSU is fine — the fault is in the cable or robot. This avoids replacing the wrong part.