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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.

EF5

External Fault at Input Terminal S5

Yaskawa · P1000

What does EF5 mean?

An external fault signal has been received by the drive via digital input terminal S5. The specific cause depends on the external device wired to S5 and its fault condition.

Common Causes

  • External device wired to input terminal S5 triggered its fault condition

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Verify the status of the external device connected to input terminal S5.

  2. 2

    Check the wiring integrity between the external device and terminal S5.

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

Related Faults

AL14Serial Communications AlarmCEMEMOBUS/Modbus Communication ErrorCPF02A/D Conversion Error
Source: Yaskawa P1000
Open Manual (Page 383)Search more codes in this manual