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EF

EF – Execution of int vector

Siemens · IQ-400 Access Control Systems

What does EF mean?

The Siemens IQ-400 system has attempted to execute an invalid interrupt vector, indicating a probable failure of the IQ-400 printed circuit board (PCB).

Common Causes

  • Probable IQ-400 PCB failure.
  • Firmware corruption or an internal software bug.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Power cycle the IQ-400 panel by safely removing and reinserting the battery.

  2. 2

    Ensure all external connections to the panel are secure and free from interference.

  3. 3

    If the error persists, contact your PCSC representative for further assistance as PCB replacement may be required.

Browse all codes in this manual (21)
Verified technical data. Last updated: April 2026

Related Faults

Door Sense LED Blinks 1 time every 2 secondsDoor Sense LED Blinks once every 2 seconds – Fault: Open circuitDoor Sense LED Blinks 1 time/secondDoor Sense LED Blinks 1 time/second – Fault: Short circuitDoor Sense LED Blinks 4 times/secondDoor Sense LED Blinks 4 times/second – Circuit NOT calibrated
Source: Siemens IQ-400 Access Control Systems
Open Manual (Page 82)Search more codes in this manual