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Hier die offiziellen error codes

RCs A6005001, A6005004, A6005007, B6005001, B6005004, and B6005007

The following reference codes may be displayed for twinaxial consoles.

A6005001 and B6005001
A console resource (controller) was not found during a manual IPL.

A6005004 and B6005004
A console device was not found during a manual IPL. A twinaxial controller was found but may not be used. This is only indicating the presence of a controller. It is not indicating the controller may be defective.

A6005007 and B6005007
A console device was not found during a manual IPL. This reference code is also indicating the presence of hardware that may indicate another console type other than twinaxial or Operations Console (Direct) was found. An example would be the old async console, no longer supported. This is not indicating a failure of that hardware or that this is the intended console.

These reference codes, as well as the attention light, will be reset when a console is detected and becomes active. It is possible that an IPL will be necessary to attempt finding a console device again if one of these reference codes exists for a long period of time, depending on many factors, including model, hardware present, etc. You can force the server to try finding the console again by doing a function 21 from the control panel, remote control panel, or virtual control panel. You can also use the 65+21 functions to gather data or attempt recovery.