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    • https://kb.netapp.com/on-prem/E-Series/SANtricity-OS-KBs/What_does_controller__7_segment_display_code_SE___dF___blank_mean
      ​ ​ ​ Applies to NetApp E-Series Answer This is a start up critical error were the controllers power on diagnostics tests have failed. How to diagnose an E-Series offline controller? Please contact Ne...​ ​ ​ Applies to NetApp E-Series Answer This is a start up critical error were the controllers power on diagnostics tests have failed. How to diagnose an E-Series offline controller? Please contact NetApp Technical Support and reference this article for further assistance. Additional Information