AEG Protect C.1000 Operating Instructions Manual page 36

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UPS is testing the battery.
Display for 10 seconds after
a successful battery test.
UPS reports a defective or
disconnected battery system.
UPS is overloaded.
UPS indicates a critical error and has
switched off the UPS output.
General UPS alarm. Details can be found
in the Alarm messages and entries in the
event log.