Ruben H Commerce City , CO May 15, 2021 Drain pump stopped working code F21 Whirlpool duet I just typed my washer brand and model, and made sure it was the right piece guided by the pictures. I got it shipped, I paid extra for next day delivery. It was easy to replace. Prices are a little high. Code F21 means your drain pump is bad. Do-It-Yourself Rating: Repair Time Estimate: 15-30 minutes