If the blue light is flashing on the WINBOT 930 when you place it on the glass, there is not enough suction to hold it to the window.
A few things you can do:
Press WINBOT 930 on the window a little more firmly.
Check for debris on the Cupule. Clean the surface of the Cupule with the provided Finishing Cloth.
The glass is too dirty for WINBOT 930 to attach to the glass properly. Clean a small area on the glass before use and place WINBOT 930 on the clean spot.
If the problem persists, please contact Customer Service at firstname.lastname@example.org