Brent V Crestview , FL February 06, 2016 F 28 error code mcu was bad I gave a whirlpool duet sport ht and the drum would not spin except for about the first 20 seconds of the cycle. I did some research and found out how to trouble shot the MCU and CCU. The MCU tested bad so I ordered the part I needed it shipped to me in two days. I installed it that night and the washer was up and running that night. Do-It-Yourself Rating: Repair Time Estimate: 30-60 minutes