In very rare cases, when initiating full OS downloads to a running PCS 7/OPEN OS system with active alarms, it can happen that active alarms in the alarm list cannot be acknowledged after an entire OS-compile in DBA.
In the same manner also false process alarms can be triggered that can also not be acknowledged afterwards.
In the case of an actual alarm that is stuck, it is necessary to:
||Make the alarm condition inactive.|
||Make the alarm condition active again.|
||Acknowledge the alarm.|
Then this alarm should work fine.