Zeror.ai Error Codes Siemens F01951

Siemens F01951

Brand: SiemensModel: SINAMICS G120 CU250S2Error code: F01951

What the Fault Means

Fault: CU SYNC: Synchronization application clock cycle missing

Likely causes

  • Internal synchronization of the application cycles unsuccessful
  • Fault value (r0949, interpret decimal): Only for internal Siemens troubleshooting.

Solution and Safe First Checks

  1. carry out a POWER ON (switch-off/switch-on) for all components.
  2. upgrade the Control Unit software.

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.