I got a new Aerotank the other day and I fell in love with it right away. Then I took it off to re-fill the tank and it stopped working. I tried everything and got nothing. Took it down to my local B&M, he played with it and it finally worked after changing out 3 coils. He gave me a few extra coils, since I bought the tank there, and now it's happening again. I think I read somewhere here that QC is not that great at Kanger these days. Has anyone else had trouble with these coils??