I had the same problem, I fixed it by cleaning the screen in the valve at the bottom of the water reservoir, the valve is spring loaded. The easy way is to get a bendy straw, cover the valve with water, hold reservoir up so that you can push bendy straw into bottom of valve then blow with your mouth until air and bubbles flow through the valve. You may get a little damp but not too bad. This fixed my Keurig immediately.