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Good evening. First I wanted to just give you a bit more insight about what you've been reading. Maytag has made two sets of 4000 series washers. Half of what you read was for the older style washer. This unit doesn't even have a wax motor. This is a new Whirlpool built Maytag washer based on the model number that you gave. Now the washer not spinning and the door staying locked is an indication that the motor control board has failed. The motor control board is mounted below the tub to the floor inside the washer. This is what actually advances the cycle and tells the washer when the unlock and it's also what controls the motor. Unfortunately it sounds like your motor control board needs to be replaced. This can also cause an F71 error sometimes even though it has nothing to do with the interface control board. They are all related to one another because they all communicate with one another. Either way, most of the time when you get an F71 error it means the motor control board is acting up as well. Below is a link to the board you'd need for your model.
CLICK HERE for motor control board
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There are 3 control boards, you never said you replaced the motor control board, just that you replaced a board. So if you replaced the motor control board and the issue persisted, then you'd need to replace the main control board mounted in the front right corner of the washer to the right side wall under the top panel. The part number for this board is W10283511.
Yes of course. There is an E-mail sent to you with a link to come back and ask follow-up questions after you rate me at no charge. Also, you may want to order the part from Repairclinic.com since they are one of the few places that allows returns on control board and that's a good option to have on issues like this which you can't actually test.