The coil resistance is less than 0.1 ohm or more than 3.0 ohm.
If the warning still pops out while coil resistance is reasonable, it may be caused by the following reasons:
I. The resistance detection component is broken, can't read it correctly.
II. The components of the product are short-circuited.
III. Screws are not tight down.
1. Please take off the tank and click the fire button, and then place that tank back on, click "n" when it asks "is it a new coil".
2. Please make sure screws are tight on the tank if you use the RBA coil on your mod.
3. Please try with other tanks or coils on your mod, and try the same tank on the other mods to check whether they work fine.
4. If it is the mod issue, please try to upgrade it, if there is an update for it: https://www.smoktech.com/faq-list?category_id=5
If the problem still exists, please try to contact us.