Siemens alarm F30012: Power unit: Temperature sensor heat sink wire breakage

What it means

The connection to one of the heat-sink temperature sensors inside the power unit is interrupted. The fault value (r0949, hex bit map) identifies the affected zone: electronics slot, air intake, inverter sections 1-6 or rectifier sections 1-2. Because the sensors are internal, the module itself must be exchanged - no field repair path is offered.

Likely causes

• broken internal temperature sensor wiring
• defective module electronics (sensor input stage)
• internal connector released after transport shock

Replacement parts

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

• 6SL3121-… Motor Module / matching power unit

  motor-module · Common cause

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