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ErrorLib — Industrial Fault Code Library

Disclaimer: ErrorLib is an independent technical reference tool. While we aim for accuracy, always verify with the manufacturer’s official service manuals before performing maintenance on industrial equipment. ErrorLib is not affiliated with the brands listed.

F108-91

Internal CPU fault

SEW Eurodrive · MOVIDRIVE MDX60B/61B Variable Speed Drive

What does F108-91 mean?

An internal fault has been detected within the CPU of the DCS..B option. This indicates a critical hardware or firmware issue with the processing unit.

Common Causes

  • CPU internal error detected by self-test routines.
  • Persistent stack overflow in CPU operations.
  • Data corruption within CPU registers.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Replace DCS..B option.

Browse all codes in this manual (60)
Verified technical data. Last updated: April 2026

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F108-101Internal processing fault PROFIsafeF108-103Internal processing fault PROFIsafeF108-105Internal processing fault PROFIsafe
Source: SEW Eurodrive MOVIDRIVE MDX60B/61B Variable Speed Drive
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