BE wrote:
My LED is displaying gibberish, but otherwise the appliance works fine.

I think it's pretty likely that the other posters are correct - this
would usually get fixed by changing out the entire controller board.
But, you might try this: unplug the oven for half an hour, then plug
it back in. Again, I'm not sure that it'll help, but it is a simple
thing to try.

Matt Roberds