Answer to "What does water under pressure message mean?"I have had my Keurig 2.0 for a couple months..this morning (1/30/16) I received the same error message (water line under pressure...)..I Googled the issue and came across this page which obviously shows people have had the same issue but no resolution. I contacted Keurig and the most helpful person walked me through the process...there is an orange maintanance cup (has an open clear bubble in the center)...fill the bubble with water and into your Keurig like a k-cup, turn the power of and open and close 5 times...after the 5th time, open and remove maintenance cup...you should (I did) find coffee grinds in the bubble...this cleans the needed which removed the pressure...turn back in and run a water only process a couple of times and you should be good to go. Was lucky I held on to that maintenance insert...I normally throw things like that away. Hope this helps!!