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0006 hex

Temperature Fell Below Minimum

Beckhoff · EL6900 Operating Instructions

What does 0006 hex mean?

This diagnostic code (found within FA00:03 Temperature error) indicates that the internal temperature of the device has dropped below its minimum permissible operating limit. This can affect the functionality of the primary and secondary microcontrollers (μC1, μC2) and may lead to unreliable operation or terminal shutdown.

Common Causes

  • Ambient temperature or internal component temperature has dropped below the predefined minimum operating limit.
  • Operation in an environment with insufficient heating.
  • Sensor failure reporting an incorrect low temperature.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check the diagnostic object FA80:01 (Temperature Primary MC) and FA80:02 (Temperature Secondary MC) to monitor current internal temperatures.

  2. 2

    Verify the ambient temperature around the EL6900 terminal does not fall below the specified operating limits.

  3. 3

    Ensure the EL6900 terminal is installed in an environment with adequate thermal insulation if operating in cold conditions.

Browse all codes in this manual (16)
Verified technical data. Last updated: April 2026

Related Faults

0005 hexMaximum Temperature Exceeded0007 hexTemperature Difference Exceeded0101 hexMax Supply Voltage μC1 Exceeded
Source: Beckhoff EL6900 Operating Instructions
Open Manual (Page 55)Search more codes in this manual