I am having a similar problem with my pool cleaner. It is the same model and it moves but it is super slow. The RPM's are about 3. It used to work and just started going slow out of no where. I have cleaned out all filters. I have adjusted the 3 way valve and nothing is helping. I have taken apart the cleaner itself and it looks good. I tried increasing the pressure on the pump from 2500 to 3500 ...BIG MISTAKE!! lol I blew off the top of the DE filter. So, I wont be doing that again. It also has never climbed the walls.
The wheels are down to the top of the notches so it might be time to replace them but I dont imagine this is the reason it is slow.
The only other strange thing my pool does is when I first turn on the pump a lot of bubbles come from the pipes in my pool ( the ones in the side of the pool that the water for circulating comes out of). This has never seemed normal to me but I have no idea what is causing it. I also dont know if this is related. I am totally stumped.
Please help! Thanks!!!