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I just happen to be a pool technician, been one for 20 years. With the equipment running, pick the cleaner up and see if the wheels are turning. If not, do they turn freely by hand?

If they turn freely by hand, then you have a plugged jet that drives the wheels, and it is trying to move with only the jet at the back of it. I would recommend you take it in to have the jet cleaned out, unless your familiar with taking it apart. A word of caution though, this is the most common thing that pool stores miss on the Polaris.

If you don’t have good water pressure, try checking the screen where it comes out of the pool wall, at the regulator valve, and that your pump is working properly.

Good luck!