I just got my Dolphin Diagnostic too, and the first time I ran it, I supervised it regularly and at first I was convinced there was something wrong, because it would NOT climb the walls, whatsoever. It was going up the slope on the sides barely a couple inches and then reversing and going the other way and it did that for at least 3 hours, so I was very skeptic and thinking I wasted my money. But I pulled it out, inspected it for setting controls and found now... decided...one more try... again, no wall climbing...

Until... I kinda of forgot about it and about 5 hours later, went back and was delighted to find that it was scouring the top edge of my pool!

It seems that climbing the walls is just about the last thing it will do in it's cycle, so maybe if you let it go, it will eventually do its job. Of course it *could* be defective, but theres my experience.