If that light flashes, it means that the service door of your coffee machine is open.
If you can't close the service door then probably the infuser is not pushed in far enough.
Hope this helps.
There will be a float in the tank, if it isn't floating then that will be the reason. Solution would be new tank or jam something plastic underneath it to trick the sensor. You will need to do a visual check in future. On the other hand if the float is floating then you will have a sensor problem which someone else will need to help you with.
leave the power point turned on.
turn off machine at the power switch (on the unit)
This should bring the unit down....or
Turn off completely unit and power point and the just turn on the power point...this should bring the unit down
Hi,I had the same problem with my Siemens EQ.300. The problem was residues that are sticked to brewing unit. Here is the solution for my Siemens EQ.300Take a plastic brush and clean all part of the brewing unit, deeply, under tap water for 5 minutes. Dry gently, and re-inserted to the Siemens EQ.300 machine.Update: After a while, same problem happened again. This time, I have washed my coffee machine's brewing unit in the dishwasher. Result is perfect!https://www.izreview.com/siemens-eq-3-espresso-coffee-machine-review/#Siemens_EQ300_dispensing_coffee_into_the_drip_tray
These machines are so complicated they have to serviced by authorized service centres at least once a year. Heat, pressure and plastic parts fail, plus neoprene O-Rings lose their lubrication properties and go hard. Yours needs dealer service.
Check the tank float, if it is not floating jam something plastic underneath it and then you will get rid of the error but will need to check water level yourself in future.