“check water” on Bosch SMS40T32UK/29

Hi,
I do have a Bosch SMS40T32UK/29 dishwasher where “check water” light starts to blink after drying cycle. I have tried to look for solution online but in most cases the “check water” light starts to blink straight away after starting the dishwasher. In my case the whole washing and drying cycles are ended and only then the light starts to blink. Can anyone have any solution regarding this??

Does anyone know how to start some kind of test on this dishwasher and how can I check the error code in result of this?

Thank you for all your help in advance.
Martin