AJF

Anti-Jam Fault

Yaskawa · iQpump1000 AC Drive

What does AJF mean?

The drive was not able to clear debris from the impeller in fewer than the number of attempts set in P7-02. This fault is effective only when P7-01 (Anti-jam Operation) is set to 1 (enabled).

Common Causes

  • Debris in the pump impeller preventing proper pump operation.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check for proper pump operation and remove debris from the pump impeller.

  2. 2

    Set the Anti-jam fault characteristics in parameters P7-02 to P7-08.

  3. 3

    Control drive response to this condition using P7-01 (Anti-jam Operation Selection).

Browse all codes in this manual (45)
Verified technical data. Last updated: March 2026

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