Kedric N Auburn , AL January 11, 2018 Appliance: Whirlpool Washer WFW8300SW00 Whirlpool Washer Wfw8300sw00: Whirlpool duet washer was giving f20 code and was not completing a wash cycle it was not washing the liquid fabric softener out of the tray. How to replace Washer Water Inlet Valve. I determined it was the water inlet valve after searching internet and talking with my local appliance repair guy. Ordered the water inlet valve and installed it. that was the fix. Do-It-Yourself Rating: Repair Time Estimate: 15-30 minutes