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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.

EF2

Pump Fault (Input Terminal S2)

Yaskawa · iQpump1000

What does EF2 mean?

An external fault has been triggered at multi-function input terminal S2 by an external device. This condition is signaled to the drive, potentially as a minor fault or a full fault depending on drive configuration.

Common Causes

  • An external device connected to input terminal S2 has tripped an alarm function

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Identify and remove the root cause of the external fault condition reported by the device connected to input terminal S2.

  2. 2

    Reset the fault on the drive keypad or via control input.

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

Related Faults

ACCUMAccumulated Level FaultAJFAnti-Jam FaultAUXFBPI Aux Lvl Loss (Wire-break detection for PI Aux Feedback Level)
Source: Yaskawa iQpump1000
Open Manual (Page 254)Search more codes in this manual