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Thank you for choosing JustAnswer.com to resolve your appliance issue. I look forward to assisting you.F11 is a drain failure code.Check the drain hose, the air gap on the sink (if you have one), and the p-trap under the sink for obstructions.
If all of those are clear, my first suspicion would be a defective drain pump. However, I have found that almost always there is an obstruction somewhere.