http://bentasker.i2p/posts/blog/house-stuff/bosch-washer-outlet-clogged-and-wont-unscrew.html
Put the machine back on the level, but don't slide it back into it's cubby yet. Plug in and start a short wash During this cycle, watch to ensure that The floor doesn't get wet when the drum fills (if it does, you didn't reconnect the hose properly) The machine successfully pumps out when it's supposed to (if not, there may be a blockage in the greywater hose) In either case, be sure to unplug again before investigating.