Siemens LME71.000A1 - Error during backup process

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Building Technologies Division Basic Documentation LME7... CC1P7105en
Infrastructure & Cities Sector 25 Operation via internal LED 29.11.2011
25.7.1 Error during backup process
Alternately
Display shows alternately bAC and Er3.
For meaning of a possible cause, see chapter Error code list
with operation via internal LED.

Note:
During backup, all settings and parameters are transferred from the basic unit’s memory to the
memory of the program module.