My keurig did the exact same thing. Stuck on large and wasn't pulling water into coffee maker so it would only dispense a small amt of coffee. I turned it off for about 10 mins. Emptied the reservoir and filled it half way with white vinegar. Ran several cups through and after 2nd brew it ran faster and after the 3rd run with vinegar all the size cup lights came back on. It is working great now. Just empty reservoir with remaining vinegar and rinse. Run a couple cycles of plain water through the coffee maker to rinse out vinegar. I hope this works for you.
The vinegar works! I had to run it four times for the fix to correct the small cups. I ran it a fifth time for good measure. I then ran clean water about six times before I brewed a cup of coffee.
Same thing happened to me, I followed the instructions laid out by 2bcont and all is well. In fact the cup sizes returned after only running through one cycle of white vinegar. It does take a while to get rid of the vinegar smell, ran through about 15 cycles of clean water before it was fine.
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