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hermann icon23t boiler water loss?

my hermann 23t combie boiler has a loss of water.I top it up with the loop but it seems to come out the presser valve have tried turning it but no luck

mike woodman
April 2010
HermannHermann icon23tHeating, Home Heating SystemsBoiler Loss Top
check the prv has reseated properly/leak in the pipework/need new expantion vessel

liam
April 2010

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Hermann 23T Boiler Losing Water - Fix?