KangerTech Subvod never worked

So I got this thing almost a year ago, got it out of the box and primed it, and it never worked. Yes it was on and the battery was fully charged, but it never actually heated up and worked properly. I gave up because I had no means of going to a shop at the time and eventually forgot about it. I found it today and was wondering if there's something I can do to fix it?