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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.

123

Under voltage

Kuka · KRC2 KSS System Message

What does 123 mean?

The internal servo output stage is not ready due to an undervoltage condition. This will cause maximum braking and inhibit all active commands.

Common Causes

  • Supply voltage dropped below the minimum threshold (e.g., P1-01).
  • Power supply unit failure.
  • Loose electrical connection on the power input terminals.
  • Overload condition drawing excessive current, causing voltage sag.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Rectify the undervoltage fault condition.

  2. 2

    Reset the fault by pressing the hardware acknowledgement button 'ACK' on the DSE I module.

Browse all codes in this manual (36)
Verified technical data. Last updated: April 2026

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Source: Kuka KRC2 KSS System Message
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