The Prime indicator on a Keurig machine means that water is not coming out of the reservoir because waste is clogging the pump. Users can fix this problem by cleaning the water reservoir and completing a few water-only cycles.
To clean the water reservoir, the user must remove it from the Keurig machine and wash it out with a soft cloth and dish soap. The reservoir should be rinsed with hot water and allowed time to air dry. The user then reattaches the reservoir and fills it with cold water. The final step is to run the machine through three water-only cycles with a mug or cup on the tray.