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my Whirpool washer front load WFW8620H keeps spinning at the end cycle until I manually shut it off I’ve noticed that if I choose the wash and dry option it shows 12 hours as estimate ( maybe totally irrelevant ) any idea if its easy to fix or needs a technician and what is the problem?

Most likely a failed timer. To get you to the correct part, please check the model number you gave and see if there are two more letters and give us those.