Zeror.ai Error Codes Siemens N01621

Siemens N01621

Brand: SiemensModel: SINAMICS G120 CU250S2Error code: N01621

What the Fault Means

Fault: SI P1 (CU): Safe Stop 1 active

Likely causes

  • The "Safe Stop 1" function (SS1) was selected on processor 1 (P1) and is active
  • Note: This message does not result in a safety stop response.

Solution and Safe First Checks

  1. Not necessary.

Safety: do not work inside the panel without isolating the power; if unsure, consult a qualified technician.

Related Siemens error codes

Source: the Zeror.ai industrial fault database and Siemens technical documentation. This page is for information; on critical systems follow the manufacturer's manual and authorised service.