Adamheis

I had the same issue. I was new to vapping and when my coil was bad I bought a new subtank for it online that already come with a new coil in it and I wanted a spare tank anyway. But when I put the tank on it was still flashing 3 times. I went to a Dr Vape and I bought a new coil. It appeared this coil was the same but looked like it was of better quality. I put the better quality coil in and it worked just fine. So even if your using a new coil, it might just be a crappy quality coil.