Not mechanical, not an expert, forgive my lack of technical terms. I love my Bosch washer and dryer. They have been great appliances for 15 years. That said, the door boot gasket on the washer has been a problem since day one. This is the thick rubber piece that attaches to the drum and then the doors glass bubble fits into it when closed and keeps the water in the machine.
The gasket rips when an underwire bra gets stuck between the door and drum, or when a coat zipper gets too close. It also just wears out from constant use and friction.
The fix. Remove door, top control panel, and front. Take it apart. The screws are easier to zip in and out that it is to wrestle the new one on without the open space. Yes it can be done, but it is much easier to just take the panel off than to bend your hands around it. There is a large metal clamp that holds the gasket in place. This large ring needs to come off it has a spring to stretch it over the gasket. Then remove the ripped gasket. That's the easy part. The new gasket fits on just right, not a tight stretch. BUT this metal ring with spring has to be lined up in the grooves and IS a tight stretch to get onto the gasket and grooves of the drum. It all has to line up and stretch perfectly or it pops off. Drain holes down. You pull one side it pops off the other. And it's a big circle so it is difficult to hold it all in place without a second set of hands. You can do it! It is possible! Line up the gasket, stretch the ring around. Sounds easy enough! Once it finally is finessed into place replace the front and top and door. And you are good to go. I'd say taking the washer apart is 10 minutes, fighting the ring around the opening is another 10-15 based on experience and helpful second hands, then another 10 to put it all back together.
Few notes- after years of this I have found that a balanced load can extend the life of the gasket. Don't over stuff it. Don't make it too heavy. And by all means level your washer. I can't control if my kids stuff 20 heavy wet towels in, but I can adjust the feet to make sure it is level to start with.
As mentioned, bras and their underwires are a main culprit, I am not extra but I did invest in an intimates bag to wash them in, not to protect the bra which is also ruined when trapped in the door gasket, but just to try to prevent this issue. See also, Lego men, pens, or hair clips, make sure you are double checking pockets! Any of those little rough things find their way into or near the gap between the gasket and door and it's done for. Coat zippers are another offender, no solutions just thoughts and prayers for you.
The door has a sensor, you will get an error code if you mess up this mechanism behind the front panel by the door latch. Easy to put back but even more so if you just don't mess with it in the first place.
I also usually do the drain filter while I have the whole thing apart, adding another 10 minutes.
I've probably changed 8-10 of these gaskets over the 15 years. Some times it lasts a couple years. Then sometimes, like this time, just 6 months. I replaced the last one on Christmas day. ???? Part is $75-90 plus shipping, if you are like me you do multiple loads every day so the instant shipping is important. $120 once a year, pretty damn expensive washing machine!!