Carmen D Squaw Valley , CA July 26, 2025 Appliance: Whirlpool Washer WFW8410SW01 Whirlpool Washer Wfw8410sw01: F 21 error code. How to replace Water Pump. Replaced pump with help from the awesome video! Almost purchased new washer first $1,000! Decided to “try” the repair first. Works like a champ! Hope to get another 20 years out of it!!! Do-It-Yourself Rating: Repair Time Estimate: 30-60 minutes