Not heating up is one thing - but no light on the iron suggests an interruption to the electrical supply.
I have one of these irons - jolly good it is too.
You might check the fuse in the plug.
If I had your iron I would try it in a different wall socket and if it failed to work then I would throw it away and buy another of the same sort - such is my bias towards the Philips Azur.
For several years now irons have been made to be impossible to repair - I think it's an EU safety thing to stop us harming ourselves...
Vote Leave!
Good Luck...
June 2016
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix steam irons.