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ErrorLib — Industrial Fault Code Library

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F403

Invalid communication phase shutdown

Indramat · DIAX 04

What does F403 mean?

The DIAX04 SSE-03VRS drive detected an invalid communication phase transition or state within its real-time network (e.g., Sercos). This means the communication process, which involves several phases from initialization to operational, did not proceed as expected. This critical synchronization error prevents the drive from entering a stable operational state.

Common Causes

  • Incorrect or incompatible network configuration between the DIAX04 SSE-03VRS drive and the master controller.
  • Timing issues or delays in the communication network preventing proper phase progression.
  • Faulty communication interface or hardware on the DIAX04 SSE-03VRS drive or the master.
  • Interruption or instability in the communication link during phase transitions.
  • Firmware incompatibility between the master and the DIAX04 SSE-03VRS drive.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Verify that the communication network configuration (e.g., Sercos phases) on the master controller is compatible with the DIAX04 SSE-03VRS drive.

  2. 2

    Inspect all communication cables and connections for integrity and proper termination.

  3. 3

    Review the communication parameters in both the DIAX04 SSE-03VRS drive and the master controller, especially those related to phase transitions.

  4. 4

    Check for any diagnostic messages on the master controller related to the communication setup.

  5. 5

    Perform a full power cycle of both the master controller and the DIAX04 SSE-03VRS system. If the fault persists, consider a faulty communication interface.

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

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Source: DIAX 04
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