Bosch washing machine beeps twice won't start

It's remarkable how many people have replaced the door lock when suffering from this type of error and it didn't fix the fault. If it's not the door lock up fault it can only be wiring, or a problem with the door latch not activating the door lock properly. There shouldn't be any reset process necessary. With a washing machine, if there is a fault, then the washing machine will not work and all display an error code. As soon as the fault is fixed the washing machine works normally.

As this fault only occurred after removing the front panel the overwhelming suspect is that something went wrong during this process. So I would remove the panel again completely check all of the wiring and fixing of the door lock. I would also examine (probably first) the door latch. Is it okay not broken in any way, is it spring-loaded in one direction so that you can bend the latch against a spring and the spring then forces it back? Try spraying a little WD 40 inside the door lock and on the door latch.