This could potentially be from a problem with the water filter in the tank. Try emptying the tank and readjusting the filter. Sometimes the filter can be shifted when filling and not allow the water to properly flow and give you this display.
+
+
[https://www.ifixit.com/Wiki/Keurig_K40_Troubleshooting|Here is a link to the Troubleshooting page. Refer to it for more information.]
This could potentially be from a problem with the water filter in the tank. Try emptying the tank and readjusting the filter. Sometimes the filter can be shifted when filling and not allow the water to properly flow and give you this display.