My problem I am having with my Marquis spa is that my old motor was blowing a fuse every month, but was still working properly. I bought a new GE Marathon motor from the Spa Depot (3HP 230 volt, 10/2.9 amps, 2 speed) and it will cycle on/off non stop on low speed only, but works fine on high speed. This is with the wet end attached and with a load of water on it. When it has no load (water), it will run fine in both speeds. I called Spa Depot and they sent me a replacement motor, no questions asked, just had to send them the sticker off the other one. I got the new one in, installed it, and it is doing the EXACT same thing! I reinstalled the wet end on my old motor and installed it, and works just fine in low and high speed. My dilemma with the old motor is it has two different stickers on it with two different model numbers, so I do not know which one is the right one. (The spa is wired 220 volt). First sticker reads: Ultima 230 volt, 11.9/3.3 amps, 2 speed, and the sticker next to that one says: Ultra Jet by Vico 115 volt, 11.9/3.9 amps, 2 speed. Both have different model numbers. Anyone have a direction I should look? Spa Depot claims I did not receive two bad motors. Anyone think maybe the new motor could be a little too small?? Please help. Thanks