If your Yocan Magneto device flashing light, 3 times blinking means it's short-circuit error, and 5 times blinking means it's not detect the atomizer.
Most of time, the incorrect connection resulted with the flashing errors.

4 tips for your refer to:
1. Clean the contact points with a q-tip, and you also can soak the Coil in isopropyl alcohol. But you have to DRY it when you re-install it.
2. Install a brand new coil
3. Pull out a little of the bottom contact point of the coil.
4. Contact the shop you bought it from, the sales guy will assist you fix it.