What should I do if my K-Duo is brewing only a partial cup or carafe?
First, ensure there is enough water in the water reservoir for your selected brew size. Then check if the exit needle is clogged by using a straightened paper clip to clean it according to the exit needle care instructions. If the water reservoir was removed during brewing, replace it and perform a rinsing brew without a K-Cup pod. If partial brewing continues, descale your coffee maker as mineral buildup may be affecting performance. (Page 6)
From the official Keurig K-Duo Dual Brew Coffee Maker manual, page 6
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