Gary B Bothell , WA November 17, 2021 Maytag duet front loader washer repeated f21 error. Looked online to see causes. This is the best website. Determined that drain was not clogged. Ordered drain pump assembly and followed easy directions with video to install. Problem solved, probably saved at least $300. Do-It-Yourself Rating: Repair Time Estimate: 15-30 minutes