Arms not turning but water coming out

Is the top spout clogged with gunk? if you dont know then just unscrew the arms and see if theres food and crap in it and if not check the pores of the arms and see if thats clogged with food just had a similar problem on my dishwasher.

You say water is coming out…how much? Perhaps it’s not enough to drive the arms around, as they are driven by water squirting out of the holes. If the water flow from the pump is partially blocked, that could be it. Clean the filters at the bottom of the machine. Also be sure the arms are not blocked by some object hanging down below the racks. This has happened to me a couple of times. Arms turn easily by hand when door is open, but closing the door moves something or other that then impacts the wash arms.

I’m not sure how old that unit is but I do know after spending many hours with my 2020 with the same issue(cycles barely push water out of the holes)that Bosch main pump impellers fail after 20 plus years and they know it so they discontinue making and selling them because otherwise they would last 40 years.An extremely smart move to require you to buy another unit.Finding the whole pump (not even the matching pump)all the impellers were the same and replacement is a snap once pulling out the pump that is.

I agree with Scott King,a blockage is what i would first rule out,remember Bosch dishwashers are build for the European market where garbage disposals are not allowed thus their filter screens need to cleaned regularly because they don’t grind waste to drains.