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vaillant turboplus losing pressure daily?

my boiler is losing pressure daily, i keep topping it up to between 1 & 2 bar and then within 24 hours its back to zero and no CH or HW! I am not losing water anywhere - help and suggestions please

Nicky Mellows
November 2010
VaillantHeating, Home Heating SystemsPressure Boiler Bar
could be flat expansion vessel

petertheplumber
November 2010

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