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I have had real problems with the dreaded DL problem on my Kenmore HE3T frontload washer. I did LOTS of searching and found no real fixes, other than to replace the control unit door lock relays, then the control unit itself.
Replaced relays. Worked for a while, but problem recurred.
One site suggested a potential source of the problem, that the wiring harness didn't make firm contact with the control unit. It went on to suggest the control unit board be "thickened" by soldering a piece of wire on to each contact point.
AHHA! Simply tin each contact point with solder. Never failed since…
This is a fix that should not be attempted by anyone not experienced in soldering electronic components.
I've "fixed" this fault code 2x now by taking off the top lid,
exposing the wires etc. ( with the power plug disconnected )
and pushing in all the connectors that I see,
both on the door latch mechanism and where they end up.
The first time we got a new door latch, but perhaps we maybe didn't need it !
These machines sure shake a lot,
and perhaps the vibration loosens the connections!?