Anybody know how to reset a Maytag dishwasher?

DH thought he'd help out, so he wanted to run the dishwasher while I was away. Unfortunately, he forgot which dishwasher soap to use and used Dawn liquid. I came home to find it beeping away (he couldn't hear it) and suds on the floor.

The error message is F8E4, blocked drain. It beeps incessantly; if I hit Cancel to stop it, it stops briefly and has a 2 second ability to drain. I wiped out everything I could reach and started pouring water into it - just enough to not quite threaten the floor. Hit the 2 second drain. Over and over. It drains like a champ now, but won't let me do anything else because the error message hasn't been cancelled yet.

I unplugged it for 1 minute to reboot. I unplugged it for 5 minutes to reboot. I tried again for a half hour. It's successfully drained about 5 gallons of water now, total, with no problem (over a number of batches). THERE IS NO BLOCKED DRAIN,

It's new and under warranty, so it won't cost us a dime in the long run. But I just hate to wait several days to have somebody in to hit just the right buttons to get the error message to stop so I can run a soapless cycle. This is stupid.

Anyway, it's unplugged now, so I don't have to murder it. I guess I'm doing them by hand in the morning. But I really don't want to call somebody all the way over to come do what'll be under 60 seconds of work.