What should I do if all the lights on the frother base are flashing?
If all lights on the frother base are flashing, check to make sure there is milk in the frother, the whisk is correctly placed in the frother, and the frother is properly seated on the base. Correcting any of these issues should resolve the flashing light error. (Page 5)
From the official Keurig K Cafe manual, page 5
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