Seems to be detecting water leaked into the base. Read these threads:
https://www.diynot.com/diy/threads/siemens-dishwasher-e15-error-factory-reset.374926/
http://www.ukwhitegoods.co.uk/forumsphpbb3/siemens-iq300-e15-and-flashing-tap-t91685.html
dsfds, September 2017