Zeror.ai Error Codes Siemens F01105

Siemens F01105

Brand: SiemensModel: PLC (S7-1200 / S7-1500)Error code: F01105

What the Fault Means

Safety function (STO) triggered unexpectedly

Likely causes

  • STO terminal wiring loose; safety relay de-energized

Solution and Safe First Checks

  1. Check STO wiring at X132 connector; verify safety relay output

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.

Siemens F01105 · Zeror.ai