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Incorrect Language Set

Incorrect Language Set — Display shows unreadable language

Vaillant · ecoTEC plus Boilers

What does Incorrect Language Set mean?

If the display language has been unintentionally set to a language you cannot understand during the installation assistant or initial setup, there is a specific button sequence to reset it.

Common Causes

  • Language setting was accidentally changed.
  • An incorrect language was selected during initial setup.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Press and hold both the 'minus' (left arrow) button and the 'OK' (checkmark) button simultaneously.

  2. 2

    While continuing to hold these two buttons, briefly press the 'on/off' button.

  3. 3

    Keep holding the 'minus' and 'OK' buttons until the language setting option visibly appears on the display screen.

  4. 4

    Select your desired language from the list using the navigation buttons.

  5. 5

    Press the 'OK' (checkmark) button twice to confirm your selection and save the new language.

Browse all codes in this manual (146)
Verified technical data. Last updated: April 2026

Related Faults

Communication fault (display/PCB)Communication fault - No communication with the PCBD.092 = 1D.092 = 1 — actoSTOR module connection errorF.0F.0 — Flow–NTC open circuit
Source: Vaillant ecoTEC plus Boilers
Open Manual (Page 19)Search more codes in this manual