Fill water tank as error message

Since the pump no longer worked properly, I have replaced it with a new one. Now comes the error message "Fill water tank", although it is filled.
It is not the pump, have the old again inserted and also here appears the same error. Where is the cause?

If it's a 970-101, forgot to connect plug from reed switch for water tank when you assembled the machine?
Or float hangs down in the water tank?

Thanks for the answer. Have all plugs plugged and also the float does not hang....

Which machine exactly is it. I do not know an E170.

As described above E970-101 CI Melitta

It says E107. That's why I'm asking.
You didn't switch the two wires, did you? Powder flap and reed switch?
You would have to notice when you open the powder flap, if the message then goes away.