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potterton promax system boiler?

the integral automatic bypass on my boiler seems to be permenently open which means it is not flowing round the sysem and is taking a short cut, can the valve on this boiler be replaced, thankyou

manch
September 2010
PottertonPotterton PromaxHeating, Convector HeatersPotterton Promax System Boiler

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Potterton Promax Boiler - Bypass Valve Issue