Zeror.ai Error Codes Siemens A01251

Siemens A01251

Brand: SiemensModel: SINAMICS G120 CU250S2Error code: A01251

What the Fault Means

Alarm: CU: CU-EEPROM incorrect read-write data

Likely causes

  • Error when reading the read-write data of the EEPROM in the Control Unit
  • Alarm value (r2124, interpret decimal): Only for internal Siemens troubleshooting.

Solution and Safe First Checks

  1. carry out a POWER ON.
  2. replace the Control Unit.
  3. clear the fault memory (p0952 = 0).
  4. replace the Control Unit.

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.