Vaillant ecoTEC Plus System F.344 – The control electrode can no longer be used. | BoilerTool

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F.344

The control electrode can no longer be used.

Vaillant ecoTEC Plus System

Possible cause

Transmission fault for calibration values

Measure

Replace the control electrode (D.146, D.147).

This code also applies to:

ecoTEC Plus Combi

Source: Manufacturer manual (PDF)

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