F-21

System malfunction

SEW Eurodrive · MCBSM

What does F-21 mean?

An internal system malfunction has occurred within the inverter electronics, potentially influenced by electromagnetic compatibility (EMC) issues. This fault causes an immediate switch-off and inhibits operation, signifying a critical internal hardware or software problem that requires expert attention.

Complete Troubleshooting Guide

  1. 1

    Inspect the grounding and shielding of the inverter and associated cabling; improve them if necessary to mitigate EMC interference.

  2. 2

    If the fault reoccurs despite verifying EMC measures, contact SEW Service immediately for diagnostics and potential repair or replacement of the inverter.

Source: SEW Eurodrive Manual