If you don't close the door within 4 seconds of pressing the Start/Resume button, or if the door latch assembly is broken, this code appears. Close the door after pressing Start/Resume when starting a cycle. The door switch could be malfunctioning if you can't start the cycle. Unplug the dishwasher. Check the door switch wire harness when you disassemble the door. If the wire harness is damaged, replace it. The door latch assembly should be replaced if the wire harness is okay.
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