J K Vista , CA April 02, 2021 Appliance: Model WSW8410SW03 Whirlpool washer f20 error code. Ordered a washer inlet pressure valve, replaced it following the video instructions and my washer works as well as new! The most difficult part was retrieving pliers dropped inside the the washing machine case. Do-It-Yourself Rating: Repair Time Estimate: 15-30 minutes