New Cornu Fe Stove - Oven door pops open

I had the exact same issue with my Cornue Fe (only on the right hand side oven). The other symptom I noticed was that the door itself didn't close as smoothly as the left hand side oven.

Take a look at the alignment of the "post" sticking out from the oven relative to the spring loaded catch on the door. These need to be *very* well aligned vertically in order to keep the door closed as it heat cycles. You'll notice that the post has a depression at the end of it (furthest away from the door). The door catch has an upper and lower spring loaded roller that is supposed to "catch" on both sides of the depression. If you are misaligned vertically, then only one side of the catch will be applying sufficient force to the depression.

In my case, the post and the catch were misaligned by about 4-6mm. In fact, I noticed that repeated opening & closing of the door was actually causing some wear on the upper roller of the catch. To fix, I needed to raise the door, which was accomplished by adjusting the hinges.

I removed the door from the oven, which can be done by removing the screws on the hinges. The hinges consist of a bottom & top knob that slot into the door (similar to the way refrigerator hinges work). The hinges themselves are made of ~1/4" metal (could be stainless, but it's relatively soft stainless). I put the lower hinge in a vise (appropriate covering to prevent scratching) and *gently* bent it up to adjust the door upwards. Putting it back together required some help (the door is heavy), but after a bit of work it was all back. Thankfully the alignment was right the first time. This whole process took about 20 minutes.

In my case, I suspect that either the wife or kids had put too much weight on the door at some point and bent it out of alignment. The problematic door had about 4-6mm of "play" between the top and bottom hinges prior to my adjustment--the working door had zero "play". You might want to check to see if you have any such play before you do this work (you can either look at the hinge itself or simply lift up on the door at the hinge point to see if it moves). If you don't have this same play, but you do have misalignment, then you'll need to adjust both top and bottom hinges.

The other possiblity is that you might have a weak spring in the catch mechanism. You can check that by gently pushing a flat head screwdriver in between the two rollers and feeling for how much force is required to separate them.

Of course, you can also just call the La Cornue service folks and have them check it out.