Product review (5 stars): F20 error on our front load whirpool duet WFW9550WL00. ...
F20 error on our front load whirpool duet WFW9550WL00. Google searches suggested this and a few other expensive parts with no real certainty but this new part fixed. If water isn't really pouring in on the fill, this might be the part to replace. My fill rate was gradual in it's decrease over 3-5 years time so I didn't notice, but the water should really pour out of that spout on the top right if you look through the window. My water had slowed to a quieter pour that would only hug the window because it didn't quite have enough pressure.