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F82

F82 Fault — External current anode not connected or power interrupted

Vaillant · ecoTEC plus Boilers

What does F82 mean?

This fault indicates that the external current anode is either not connected, or its power supply has been interrupted. This is relevant if an external current anode is installed.

Common Causes

  • External current anode not connected (X43 edge connector with bridge missing)
  • Power supply to the external current anode was interrupted
  • Cable between PCB and external current anode defective
  • External current anode defective

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    If an external current anode is NOT installed, ensure the X43 edge connector with the bridge is present on the PCB.

  2. 2

    If an external current anode IS connected, check its power supply for interruptions.

  3. 3

    Inspect the cable between the PCB and the external current anode for damage.

  4. 4

    If issues persist, the external current anode itself may be defective (contact a technician).

Browse all codes in this manual (100)
Verified technical data. Last updated: April 2026

Related Faults

F.0F.0 — Flow–NTC open circuitF.1F.1 — Return–NTC open circuitF.10F.10 — Flow NTC short circuit
Source: Vaillant ecoTEC plus Boilers
Open Manual (Page 8)Search more codes in this manual