As an extra note, our symptoms were also hearing clicking from the control board as it would try to 'lock' the front door. It would click a few times, then give up and throw the DL code. If opened the lid in time, while clicking, we could jiggle the pink wires and the door would normally now lock - which made me think it was a connection problem with plug to the board or the board itself had a bad trace line. In the end though, it was the K4 relay.

It worked! Thanks. We have an HE4T, bought around 12 years ago. Used twice a day. For the last couple of years it would throw an occasional DL code, and we had the ritual of opening the top and jiggling the pink heavy duty wires at the control board and that seemed to work. Went on like this for a long time. We had a matching set of W/D and pedestals so I didn't want to give up on them. I do have some electronics background, so I was keen to fix it. I thought maybe the one of the plugs was bad, or even the board. I removed the board and re-soldered key areas I thought may be the problem, even soldered wires direct from the 4-lead DL pink plug to no avail. It turned out it was the K4 RELAY, not the K1 for us. The K1 looked perfect, but the K4 had arc dust on the closing set (normally open) contact. I filed the contacts with fine grit paper. But I swapped the two relays upon reinstallation (let the other cleaner really have a go at the next 12 years). So far all good. Will buy new relays though.