Pool and Spa
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There are several parts internally that make the unit move and rotate. It sounds like the rotation part is good but the parts that make the feet move are not working. Here is a parts breakdown picture so you can see what you need to inspect. http://www.poolcenter.com/p/aquabug-parts-kits
Look at the Universal A-Frame/Turbine kit, this has bearings that must be there and in tact to rock back and forth which in turn make the feet go up and down and drive the unit forward. I think this is where your issue is.