Electric range malfunction - ideas?

We have a GE Tru Temp electric range in a rental, which for the second time in as many months has gone gonzo in the oven, out of control in an oven set at 400 degrees. after about 20-25 minutes, and showing an F2 code up top. Gets hotter.

Unplugging it kills it, but even after all the controls were shut off, the upper heating element came right back on when replugged, so pulled the plug again. Using my magically transposed superstitious behavior from handling AV and stage gear, I then repeatedly rotated all rotary switches, having cleared any electronic commands and assuming it was crud in the 'mechanicals. 'Back in the game, working OK.

No way I'm going to buy a new one, and the landlord's maintenance is a poor joke. GE related websites suggest some possibles, but I thought I'd stop here, too.

For the curious, it was four frozen chicken pot pies (400 for 55 min). Ya, I know that's crap, but I like 'em...