F16 on a Bosch indicates the door is open / unlocked.
If it's happening during a wash it would suggest either a faulty door lock, faulty wiring or worse, a faulty main control board.
The wash programme should halt when this comes up but you should be able to restart it when the door is closed.
As
the cost of a new door interlock isn't overly expensive I would suggest
fitting a new lock on a "fit and see what happens" basis.
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