My Bosch dishwasher was complaining it was blocked. I followed the instructions on clearing blockages. There were numerous videos on-line showing how to clean the filter and remove the pump cover. None of this helped to fix the problem. I was beginning to wonder if the machine was broken.
I decided to remove the drain pipe to see if there was anything in there. Water ran out as I disconnected it, so there wasn’t an internal blockage.
I then stuck a screwdriver into the drain inlet. It hit something hard. After a bit of hitting around the blockage was dislodged. It seems that it was fat along with solids that made it through all the filters.
After connecting the hose back up, the machine worked fine.