What's wrong with the "Protection" signal on Joyetech eVic VT?

Joyetech eVic VT is a temp control device and it supports two temperature control modes(Ti and Ni), which is a great advantage over other box mods. Most of vapers using this box mod will try its temp control function. With careless operation, you may give it a start on high temperature to enjoy cloud vapor production. But in terms of this situation, the "Protection" remind easily appears because your coils may be burning. Then how to solve this problem, suggest starting at low temperature and gradually working your way up to find your sweet spot, write the temperature down and that means it's the most suitable temperature for this current coils and eliquid. And when you change to other kinds of coils and eliquid, you should follow this same way to find your another sweet spot.