The E01 fault code appears when the control board detects a door lock issue. Before you take any action to clear the error, make sure the door is closed properly. Unplug your machine or turn off the breaker for a few minutes to reset the system. If the error was caused by a glitch or power surge, it will disappear after the reset. If not, the whole lock assembly may need to be repaired or replaced.  Also, there may be a problem in the control board itself or the wire harness.