Hello,

1. CheckWinCC ExplorerandRuntime Statuson OS1.
2. Review theWindows Event Viewerfor errors or warnings.
3. Ensure properredundancy configurationand verify that OS1 is correctly synced.
4. Checknetwork communicationbetween OS1 and OS2.
5. Verify that there’s enoughdisk spaceon OS1.
6. Perform aredundancy switchoverand test whether OS1 can take over.
7. Ensure that all relevantWinCC servicesare running on OS1.
8. Considerre-downloading the projectto OS1 if needed.
9. Check for anypending updatesor patches for OS1.

By going through these steps, you should be able to diagnose the issue with your OS1 server. If the problem continues, it may be necessary to escalate the issue to Siemens support for further investigation.

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