Most likely a drainage issue, see here: http://www.how-to-repair.com/help/bosch-neff-or-siemens-dishwasher-not-emptying-fault-e25-error-code/
And here: http://www.fixya.com/support/t4064409-dishwasher_not_draining_e25_error_code
There’s a video there that might help if you’re a DIY kinda person.