Led flashes red 4 times during vaping
Screw on the atomizer then press fire button, then Led flashes red 4 times
Check if the coil is screwed on tightly or try a workbable atomizer on the mod.
Led flashes red 15 times during vaping
The voltage of mod is below 3.2v, so that it can not fire
Make sure the 18650 batteries with sufficient power