Thank you for posting your question here on Fixya.com.

The power pack button 'pops' off or the Dolphin cleaner stops? If the switch pops the problem is almost always inside the power supply. If the unit itslef is stopping in the water there are several issues that can cause that.



For starters, try the tip I posted here on Fixya, found at: http://www.fixya.com/support/r3651526-dolphin_pool_cleaner_wont_start_up. If that is not enough, try our sites FAQ section on Dolphins at www.arrowpools.net. Select the FAQ button then from the drop-down select Dolphin.



If none of this helps your problem could be in the power supply, cable or motor unit.



The motor unit is the most likely problem; the motor(s) inside it is probably failing. When the drive motor and/or impeller motor move you can assume the power supply and cable/electric connections are ok.



Whether the unit is in or out of warranty you can either send it to a service center (which we are one) or try to repair it yourself however it is not recommended you open the cord end that connects to the motor unit as you are breaking the seal for the submersible electronics. You should also be aware that there are no parts available for inside the motor unit. If anything inside is damaged a whole new assembly is required. The motor unit for that cleaner is about $400 and when installed by a non-service center does not come with a warranty so you are better off sending it in for a complete diagnosis and estimate.

For information about the repair and sending it to a center you can contact Dolphin direct at www.maytronicsus.com or our site at www.arrowpools.net.

If this answer does not fix your problem, please comment with additional details prior to rating the answer. Positive feedback is appreciated once your problem is solved!

John