Well,this has happened to me quite a few times,so I thought I'd leave it here just in case someone needs it.you've just filled your nebox tank,and you get a reading of 9.99 ohms.take the coil out,hit the fire button once,replace your coil,hit the fire button once,it should read old load-,new load+,choose new load,if this does not work,put in a fresh coil,and it should show the same after hitting the fire button once,it sometimes does it automatically. I figured this out on my own,lol.Hopefully, none of you ever have this issue,but if you do there ya go.happy vaping!