Are these dishwasher symptoms consistent with a blocked drainage hose?
Where does your dishwasher drain hose go? It should go to either an air gap or a high hose loop. An air gap is a metal/plastic gadget, normally on top of the sink, that has the dishwasher output come in one hose and another hose that goes down to sink drain/disposal. A high hose loop has one hose that goes from the dishwasher, loops up to just under the counter (and at a minimum, above the bottom of the sink) and then goes down to the sink drain/disposal.

If you have a high hose loop but it fell down then that would explain at least some of these symptoms. If you're not sure, post a picture of the hose/drain/etc.

The manual you linked is for use, not installation. I found a Bosch installation manual and while it does not include a diagram of a high hose loop connection, it does reference that in the text, so that is definitely a possibility - and therefore a "high hose loop that isn't high or a loop any more" is also a possibility.