It could also be that your carto isn't wet enough. I condom fill my cartos so I'm sure that the coil is wet and then check it's ohms on the provari.. I've got one or two that wasn't right.. then, if the carto reads the right resistance, I put it in a
tank. I've also got to where I use a multimeter to check the carto before I even fill it the first time. I use the AO feature a lot to keep check on my cartos while in use. I had a few of the resurrectors that would go up and up in resistance as I used them. I love the error code feature.. it tells me when something is wrong and what it is. I've occasionally (when I first got it) gotten an error code when an atty that I was dripping on got too dry or a carto that wasn't in a
tank got too dry. I rarely if ever see an error code now, especially since I upgraded to V2.