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Mend Valiant 823 Boiler Pressure Heating

How do I reduce the pressure on my Valiant Turbomax boiler?

My valiant tubomax 823 boiler is showing a pressure of 3 bar (in the red). I found a knob to turn which releases water out of the overflow and the pressure reduces, however as soon as I switch heating bavk on pressure increases to 3 bar again??? Pressure should be about 1 to 1.5 bar I think.

Jonathan
January 2005
ValiantValiant 823Heating, Home Heating SystemsBoiler Pressure Heating
ARE YOU SURE THE FILLIN LOOP IS NOT OPEN IF NOT PRESURE VESSEL GONE ON BACK OF BOILER

STEVE B&H
January 2005

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