There are a few possibities...
if you remove the lid and take the two t20 screw off the left side panel at the front you could check the pressure chamber and its hose are not blocked. Use the link and go to page 4, part 263834 and 361113. You can also remove 165263 (remove t20 screw via the sump after all filters are removed) this will expose the pump impellor and you can check for any obstruction.
Try running a 65 degree wash with a couple of caps of baby sterilising fluid. If the d/w is connected directly to the sink, remove the spigot and check there aren't any blockages. I run a dishwasher cleaner thru my d/w every 3 months and every couple of week I will load the machine for a wash, add tab to dispenser and just after starting a 65 degree wash, I will open the door and tip in approx one capful of sterilising fluid.
baby fluid is also good as a sluice wash for your washing machine on 90 degrees (w/m empty, approx every 4 weeks).
https://www.bosch-eshop.com/eshop(bD1lbiZjPTAwOQ==)/bosch/gb/prodp.htm?prod=SHU6802UC%2f12&ESHOPTYPE=S
ps I appreciate the link is not for your model but the part placing should be the same.
I hope this helps, Good Luck.
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