Dave J Harding , PA November 26, 2021 Appliance: Model WHIRLPOOL DUET WASHER F21 error code (drain problem) F21 after tub would fill with water and pump would start and buzz very loudly. The pump Motor was very warm. I purchased new pump from appliance parts plus. Installed pump And machine cycles like it should Do-It-Yourself Rating: Repair Time Estimate: 15-30 minutes