absurdum technicae

In what could have been the most expensive raclette ever, I almost get rid of my oven! Last weekend, to fight the ongoing cold wave, we decided to have a raclette with mountain cheese and potatoes, but the raclette machine (mostly a resistance to melt the cheese) had an electric issue and kept blowing the meter. We then decided to use the over to melt the cheese but, while giving all signs of working, it would not heat. Rather than a cold raclette, we managed with the microwave (!), but I though the oven had blown as well. The next morning, I still checked on the web for similar accidents and found the explanation: by pressing the proper combination of buttons, we had succeeded to switch the over into the demo mode, used by shops to run the oven with no heating. The insane part of this little [very little] story is that nowhere in the manual appeared any indication of an existing demo mode and of a way of getting back to normal! After pushing combinations of buttons at random, I eventually got the solution and the oven is again working, instead of standing in the recycling bin.