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Vaillant Boiler losing water pressure?

Have a vaillant combi bioler that has lost its water pressure but when i try to fill it up the water,the pressure goes up and then the water goes straight out the overflow pipe and the pressure drops to zero

Nash
December 2010
VaillantHeating, Home Heating SystemsVaillant Boiler Water Pressure
either strip and clean pressure release valve or change it

brian
December 2010

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