Why won't my coffee maker brew?
The water level must be at the minimum line to brew. Add an additional 2 oz of water to the reservoir to ensure the minimum fill level has been met, then press the size button. If this doesn't work, lift up and replace the reservoir to ensure a secure fit on the base. (Page 5)
From the official Keurig K-Express Essentials Coffee Maker manual, page 5
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