I suspect it is some kind of mechanical or electric connection that is not working but am at a loss on how to find out how to fix it. It is a few years old but works fine.
I sometimes get it to work by opening or closing it or pushing on the door.
the door shuts tightly even when the error code says it is open.
EDIT The problem is intermittent.
TROMM Steam washer Model number: Wm2688HWM