We have a Dolphin Diagnostics, bought 7 or 8 years ago. It has generally been satisfactory, but the repair service has not been a happy experience. 3 or 4 years ago, out of warranty, of course, the strain relief on the AC power cord failed. Looking at it I knew that I could replace it myself IF I could get the part.
I contacted Maytronics; they refused to sell me the part and for repair required me to ship the entire unit to them at a cost of about $60. After a bill of over $100 plus another $60 for return shipping the Dolphin returned, with the strain relief fixed (I'd estimate the part cost 50 cents) and a "reprogramming" of the unit, plus a float attached to the cord. The unit now doesn't climb the walls as well as it did before the "repair."
Yesterday, after "Dolph" had performed wonderfully for 2 or 3 weeks it decided to run for no more than 10 or so seconds. After the 30 second off period it will once again run for 10 or so seconds. I've left a message with Maytronics, now located in Norcross GA less than an hour from me, but had no response.
Any ideas? If it's power supply the cost could be too close to replacement cost. I wonder if something is jamming the tracks, although they seem to turn easily enough by hand. I've taken off side panels to replace a track before; it's a nasty job, very tight quarters to run a screwdriver.
Or is Ol' Dolph just at the end of his life?