Bosch Dishwasher Not Draining
This video will show you step by step how to remove the filter and clean inside the sump. You can gain access to the drain pump impeller and check the back flow preventer.
Disclosure: Bear in mind that some of the links in this post are affiliate links and if you go through them to make a purchase I will earn a commission. Keep in mind that I link these companies and their products because of their quality and not because of the commission I receive from your purchases.