Re: gaggenau oven
There was a problem with some of the pyro ovens locking the door, if self clean is not used much.
Opening and closing the door would cause a quick pulse of power to the lock motor, so after sometime(months) the motor had moved enough to lock the door.
Selecting then deselecting self clean will resolve, for a while.
A permanent solution was to fit a new (updated) module that, cunningly, will retract the motor in the early hours of the morning, when nobody would be about.(providing the clock was set correctly) 😉