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Mend Vaillant Turbomax 828e Combi Boiler Heating

Vaillant Turbomax 828e combi boiler?

Do I turn the filling valve to increase the pressure, clockwise or anticlockwise?
The filling valve key is absolutely tight - unable to turn at all.
Any suggestion please.
Thank you.

C J
October 2016
VaillantVaillant Turbomax 828eHeating, Home Heating SystemsVaillant Combi Boiler Heating

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