Vape cartridges and disposables can often get clogged and appear to be useless/faulty. Keeping the system in your hand to get a moment or so to warm it up and after that accomplishing a couple of small tricky puffs might help get it likely. You could have to do this https://lukasglprt.bloggazzo.com/30137812/not-known-details-about-thc-carts-battery