I did trouble shoot this issue based on information on various blogs. Most of all the blogs kept pointing me in the direction of replacing the Pressure switch and hose. I had already cleaned all intake and drain and hoses and recalled my dad had an issue similar to this a long time ago and it was the water valve so I took the chance and ordered it. I received it on Friday and installed in on Saturday, F 20 code GONE!! Washer is like new again!!! Thank you.