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Error: Inhibit on Dos Pressure 1 and 2.
This is a typical error appearing when physicist operate the linac.
On one of the pages the pressure sensors are displayed. Item 758 and 759. For a unknown reason a default 0 is displayed at part 1. When the cursor is moved down the screen with the enter button the 0 is entered as a new value. The linac will reset the limits, part 19 and 20 to a value of about 600. The linac will inhibit at the next beam.
Usually nobody knows and they will make you believe the linac did it by itself.