I discovered a simple solution that has stopped the F14 error on my 2010 model Miele dishwasher.
After doing all the cleaning, checks for blockages, rotating impeller etc nothing was working. The pump and drainage all sounded good (normal) but the machine would stop after 4 minutes. I began to think it was a sensor problem or perhaps a problem with the water pressure to my home. After trying the following, amazingly, I haven't had the F14 error for over a month.
As you can hear at the start of the auto wash program, the dishwasher drains any leftover water. When the machine starts to fill again, wait 10-20 seconds, open the door and pour in 4 litres of cold water. Close the door and the machine should keep going to the end of the program.
Not sure actually why this worked but I haven't needed to repeat the process again.
I'm going with a sensor issue.
Jim
October 2016