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Hi, thanks for using JustAnswer.com, Brian in Charlotte! The F28 your washer is displaying is due to a communication issue between the boards. There are several control boards in your washer and they talk via little data cables. If they cannot pass information properly, you get the F28 you are now seeing. The most common cause the F28 is poor connections. The first thing to do is unplug the machine, remove the top of the machine (3 screws along rear of top), remove the rear panel (lots of screws), and locate the motor control board and the machine control. The motor control is located at the bottom of the machine, to the side of the tub. The machine control is mounted on the right side of the cabinet up at the top just behind the front panel. Once located, CAREFULLY remove each connector, one at a time, and reinsert it back into its position. Then move to the motor control and do the same thing. These little connectors build up resistance very easily and are likely the root of your washer problem. Let me know what happens once this is completed and the washer is plugged back in.