Siemens alarm A30919: Power unit: Temperature monitoring failed

What it means

Temperature monitoring inside the Servo Motor Module has failed - one or both internal temperature sensors can no longer be evaluated (bit-coded in the fault value). Without thermal supervision the drive cannot guarantee protection against overheating, which is why Siemens prescribes immediate replacement of the power unit rather than continued operation.

Likely causes

• failure of internal temperature sensor(s)
• evaluation electronics defect in the module

Replacement parts

We supply the following units for this alarm — tested, warranty-backed:

• 6SL3121-… Booksize Motor Module (match rating)

  motor-module · Common cause

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