Darryl M Wildwood , MO March 31, 2018 F20 error code I purchased a new water valve and installed it. Since then I haven't had another F20 error code. It's been about 5 washes. Before the new valve, virtually every other washing resulted an a F20 error code. 1 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 15-30 minutes