Just bought a Yocan uni. Put in the cart and it flashes eight times. I can't adjust the voltage or take a pull. It blinks 8 times no matter what I do. Its not on preheat either.

First of thanks for choosing our product, and sorry for the inconvenience.
Please try to charge your UNI battery, flashing 10 times mean it is low battery.

Any further question, please let me know.