Vaillant ecoTEC Plus System F.320 – The heating pump is blocked. The unlocking function was not successful. | BoilerTool

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F.320

The heating pump is blocked. The unlocking function was not successful.

Vaillant ecoTEC Plus System

Possible cause

Dirt or foreign bodies in the pump

Measure

Clean the pump and, if required, replace the pump.

This code also applies to:

ecoTEC Plus Combi

Source: Manufacturer manual (PDF)

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