Siemens Fault 0a7991 Fixed Jun 2026

: If you see both, there is likely a communication issue with the PLC. If no PLC is connected, set P2030 = 0 (No protocol) and perform a RAM to ROM save before restarting.

: If the alarm returns even after you thought it was finished, it likely wasn't saved to permanent memory. Ensure you perform the RAM to ROM save procedure . How can resolve the alarm Code 7991 and 8526 - SiePortal siemens fault 0a7991

: This turns off the motor data identification and rotation test. : If you see both, there is likely