Hey, I just did this one with the E24 code, if it is pumping out fine and does it in the first 2 minutes replace the lower board on the bottom right of the unit. That is the issue.
You might be on to something here. i just found this:
I'm wondering if a lot of people are having these issues; I have had for a while. Blew out the drain hose (no problems there), replaced the drain pump, checked for obstructions over and over, and I, like the OP, can only avoid the E:24 by opening the door within the first minute and shutting it again.