If the airflow section of your tank is out of alignment, it can throw up some connection issues causing the coil to fail to read on your battery or device. Often this related to the device being dropped or knocked, but it's normally a straightforward process to put right.
The tank should appear straight and in alignment when you look at it head on. If you notice a slant, or sizeable gaps between sections of the airflow as pictured below, it's very likely that this is what's causing the issue.
It’s an easy fix though:
- Take the airflow off of your tank
- Take the coil out of the airflow
- Place the airflow on a solid surface
- Push down on the airflow with plenty of force (easier to do by placing a heavy book on top). It might ‘pop’ as it slots back into position
That should be enough to realign the airflow, allowing for a solid connection between the tank/coil and battery, and resolve the issue.