Re: Bosch dishwasher SMS 5092 GB/11
The outlet pipe does not go through the aquastop, it simply runs through a common sheath so if you access both ends of it then you should be able to blow through it. If you can’t then there is simply a blockage in it.
Accessing the machine end of this hose is extremely difficult (not really DIY), and if you tried blowing through from just the drain end without disconnecting the non-return flap valve will prevent you from doing this.
If you need an engineer then have a look in Repairs@ for someone local to you.