If the battery can't detect the atomizer due to the bad connection of the atomizer to the battery, the LED will flash once after pressing the button and won’t activate the atomizer. Color of flash can be red, blue, or green depending on the battery level.
Steps to find the solution:
Make sure the contacts between the pod and battery are clean, unobstructed, and have no liquid condensation.
Reinstall atomizer in the pod(drain the liquid before if needed).
Replace with a new atomizer or pod.
Contact the seller for additional help.
If the device has entered sleep mode (30mins without use), the LED will flash once after pressing the button but no vapor is coming out. Press again now to vape as the first press has activated the device.