Nacjoe for Model Number MHWZ600TW01 Epic Z is displaying F28 code. Checked wiring, ohmed motor and wires between MCU and CCU check ground switches and made sure they were opening when depressed. Replaced MCU and still have the problem. CCU clicks when power cord is plugged into wall socket. Start cycle and door locks and that is it. Door won't unlock by the control only manually. As I am waiting, I can hear occasional clicking like there is cycling of relays but no motor action, eventually the F28 is displayed. Thinking I need to try the CCU board next. Any other suggestions? I work on $350000 CNC equipment and at least I can get factory tech support when I have problems with them. Maytag won't even talk to me to help diagnose a $650 washer. What a joke.
Answer Hello Nacjoe. Possible Causes/Procedure - Unplug washer or disconnect power. - Check that the power cord terminals are connected at the right position to the RFI filter (white-Neutral/ black-Line). - Check that the two ground switches are pressed correctly by the toe and rear panels. - Check that ground switches are fitted correctly, and are not broken and the green ground wires are connected correctly. - Make sure that both ground switches are not broken or scratched. - Make sure that all the ground harnesses (green wires) are connected correctly, and are not broken or with wires detached. - Make sure that all wire harness connections from the CCU (MI3 cavity), main Motor, and MCU are not broken or with wires detached, and that connector internal pins are visible. - Check for continuity from the MCU connector wires to CCU (MI3 cavity) connector. - If the continuity diagnosis failed, the Main Harness must be replaced. - Make sure that all the connectors are fully seated. - Check the drive system for any worn or failed components. - Plug in washer or reconnect power. - Verify the unit operation by running the Diagnostic Test cycle. - After the diagnostic test has finished, unplug washer or disconnect power and wait for 15 seconds. Read More... Answered by AppliancePartsPros.com | Wednesday, July 8, 2015