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vallient boiler ?

when it says f.22
mandy purvis, January 2009
dependent on the model you have its normally the pressure is to low. you will need to up the pressure to between 1-1.5 bar. again dependent on the model the filling loop may be external or internal of the boiler.

andy, January 2009
link Click here to see other fixes for Vaillant ecoTEC plus VU 22.