Ответ на "K duo essential. All 5 lights in solid"My husband’s did the same thing and we couldn’t figure it out. We called Keurig and they couldn’t help either. My father in law fixed it rather quickly. When you open up the Keurig where the lights are, where they connect, it was loose. We don’t know how it happened, but he just tightened it up, and it works perfectly fine now.