What do I do if the cartridge sticks?

This occurs very rarely, and if you don’t remove the silicone cap, it’s even less likely. However, if it does happen: Clean the hole in the black ceramic element with a toothpick, disconnect the cartridge from the battery and clean the contacts there as well. Heat the cartridge vertically (for example in a small cup) in the oven at 60°C. In winter it can happen more easily that the mass becomes too solid. If you do not have an oven at hand, you can also heat the cartridge with a lighter until the extract in the cartridge is liquid.