New to the vivi nova mini. Came in a pack with 2 spare coils. One already fitted worked fine tried another to try different flavour nothing. Then tried the other spare still nothing. Only the original works (what came fitted in the centre pipe. Could it be just a dodgey batch of coils. Or something more sinister as my centre pipe sits slightly off centre and has a small dent on the outside near the coil thread and could it be its been damaged with the coil what came already in and has bent to not heat another coil if its inserted?