Jeff M Dickinson , ND January 15, 2024 Appliance: Whirlpool Washer WFW9200SQ02 Whirlpool Washer Wfw9200sq02: F20 error code. How to replace Water Valve. Replaced water inlet valve, pressure switch, and pressure hose. Do-It-Yourself Rating: Repair Time Estimate: 30-60 minutes