Dolphin Diagnostic 2001 Only Runs for 2 minutes - Controller Power Supply or Transformer?

by John Callaghan
(New Jersey)

Our Dolphin Diagnostic 2001 turns on fine. The impeller at top spins and water flows through it, and it moves as if it's about to start it's normal cleaning.
But only after 15-30 seconds of starting up, the impeller at the top stops spinning.
It then still moves for at most 2-3 minutes, where it finally just stops.

Any idea what this could be?
Curious if these symptoms of only running for 2 minutes with the impeller at top only running for 30 seconds are a sign more of the controller power supply being the culprit or the robot itself, specifically if it's the transformer inside the robot.

There is nothing physically obstructing the robot.

I spotted a universal controller power supply on Amazon for 200 dollars.
If these symptoms are more indicative of it being an issue with the controller power supply, I may purchase the universal controller to see if it'll run again - fully run for the normal 4 hour or so cleaning session.

Thanks for any feedback.

- John Callaghan
New Jersey