IBM 3745 Problem Determination Manual page 58

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ALARM 81: MANUAL FALLBACK OR IPL COMPLETE CCU-x hhmmss ref code
Cause:
Action:
Manual fallback 'on a twin-standby 3745 or resulting IPL has been completed successfully.
No action required.
ALARM B3: MANUAL FALLBACK OR IPL FAILED CCU-x hhmmss ref code
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119~.:·~19.
Cause:
Action:
Manual fallback or resulting IPL failed because of a hardware error.
CCU
Main storage
Processor switch
co
and give reference code.
ALARM B4: HOST OPERATOR NOTIFIED: SWITCHBACKIO BE PERFORMED hhmmss ref code
Cause:
Action:
The host operator has been notified that'3 switchback is to be performed by the operator.
No local action required.
ALARM B5: SWITCHBACK AND IPl COMPLETE CCU-x
hhmmss ref code
Cause:
Action:
Switchback has been completed successfully.
No local action required.
Chapter 1. Alarms and Alerts
1-41