
The “water tap” appears in the display when there is a problem with the water inlet.
Reasons might be:
1. Problem with the water inlet filters
2. The supply hose is blocked or kinked
3. The water pressure is too low
You can find more details here.

Have you checked the tips and the issue isn’t solved?
If you have followed the information above but you're still having problems with your Siemens washing machine, then you might want to have it checked out by a Siemens professional.