Good morning

I have received two days ago my new sensor. I am not able to start the sensor to proceed with the installation.  

When I press the power button it makes a short flash in red after releasing but does not turn to white , blink or green.  

Same effect when I press quickly  three times or six times.   It only produces a short flash in red.  I can not proceed with the installation as my app does not find the Netro wifi of the sensor as it is off.    I tried to leave the sensor under solar exposure for a full day with no change in the behavior.  Still just a short red flash after pressing the power button but nothing else.

Can you guide me how to solve the problem?