What can be wrong with my Yocan UNI Mod 1 the magnet will not connect.

During the manufacturing process, there can be some tolerance in extrusion on the center pin, and the UNI Mod does not have a spring-loaded center pin on the magnetic 510 adapters. So, when you press the button and get blinking lights, one of two things is happening:

The cartridge center pin is recessed and not making sufficient contact, the UNI mod can’t load the cartridge correctly, and flash 5 times.
The cartridge center pin is extruded and getting pushed in, causing a short, the UNI mod flash 3 times.

So, there are two ways to fix UNI Mod flash issues: switch cartridge or loosen the adapter.
Learn more on this page: https://www.yocanonline.com/yocan-uni-b ... available/