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The E:04 error is a door lock error or it may be an over sudsing issue, see attached page. Since it does work sometimes, the issue is not likely to be with the door but with the pressure switch circuit. Have you looked at the pressure hose for blockage?
If you remove the top panel from the machine, the pressure switch is mounted at the top of the cabinet and has a very small hose attached to it. If you remove that hose and blow through it (the hose), does air easily pass?