Water control lamp lights up continuously

Hello dear coffee community
,I have a Delonghi Dinamica ecam 350.15.b. At the last descaling ptogram the water control lamp has not gone out. I have already replaced the reed sensor. Unfortunately, this has brought nothing.
I hope you have some tips for me.
Thank you very much
GreetingsTobi

Water tank not properly in the machine. Does not the still have a switch that detects the water tank? Have you ever checked?

Hello Schlawi
,Thanks for your answer.
I do not know this switch. I can't find anything like it in the manual or on the machine.
Do you know where it is located?
Greetings Tobi

There is a nose on the top back of the water tank. See picture

1000 thank you! That has solved the problem. Until I get the new tank I can slide a wedge in there as a replacement. The new tank is already on the way.

Great, glad it was / is so easy.