0.0 means there's a short. Most ProTanks come with a spare head. If you have one, try changing it out (remove the bottom, unscrew the long stem from the base, the entire inner part should come along with it). If a replacement head doesn't fix it, that probably means there's some internal damage to the protank somewhere in the threading area. Do other atomizers work on your Vamo? If they do, then there would be a problem in the ProTank.