Bosch SGS55CO2GB Bottom Arm not spinning ?? Home › Forums › Public Support Forums › Help And Support › Dishwasher Help Forum › Bosch SGS55CO2GB Bottom Arm not spinning ?? This topic has 1 reply, 2 voices, and was last updated 13 years ago by gray. Viewing 2 posts - 1 through 2 (of 2 total) Author Posts April 1, 2013 at 4:42 pm #74832 grayParticipant All the normal things checked, ie filters and any blockages in the arm. Top arm spins OK. I would have thought that would be a bottom tray washer solenoid, as it has a top tray only button. Any ideas please. Next step would be to remove the whole of the filter/pump housing, but how do I do that ?? April 1, 2013 at 5:30 pm #393022 MartinParticipant Re: Bosch SGS55CO2GB Bottom Arm not spinning ?? The ‘instantaneous water heater’ needs replacing. That unit contains a water diverter valve that supplies the top and button spray arm. Major dismantling required to replace. 🙁 Author Posts Viewing 2 posts - 1 through 2 (of 2 total) You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Log In