Without testing on a multimeter, I'd guess it's trash. They are disposable, there are faulty ones fresh from the factory, then their are ones that last a month of chain
vaping.
Could use some more info too. Didnt work at all or worked till you vaped it dry and now doesnt. Usually keep mine topped off
through out the day and rotate them to keep them cool and moist. Havent killed one yet, but new to cartomizers.