The last comment I saw from Fitbit on the subject of LED on the front of the Surge advised contacting support immediately since it isn't currently used for anything and shouldn't be illuminated.
Mike | London, UK
Blaze, Surge, Charge 2, Charge, Flex 2 - iPad Air 2, Nokia Lumia 925 (Deceased), iPhone 6
Take a look at the Fitbit help site for further assistance and information.