Mark L Waltham , MA June 08, 2019 Appliance: Whirlpool Washer WFW8300SW05 Whirlpool Washer Wfw8300sw05: Whirlpool Duet washer error code F20. How to replace Washer Water Inlet Valve. Watched YouTube video, how to repair F20 code on Whirlpool washers. Very helpful and informative and he recommended appliance parts pros.com (apps.com) for parts and repair videos. Found replacement, and placed order with apps.com, and watched video on how to replace water inlet valve. When part came, followed the instructional video and replaced part. Very easy repair finished in about 40 minutes. Do-It-Yourself Rating: Repair Time Estimate: 30-60 minutes