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Have a Vaillant Ecomax 824E Boiler?

Central heating put back on after summer break, fault signal E 12 appears.
Water pressure guage keeps going sky high, and is not in the "green" section.
Water overflowed first day, the tap water is warm but not very hot.

Have no idea what to do, help

Mrs Useless
October 2007
VaillantHeating, Home Heating SystemsVaillant Central Fault
SOUNDS LIKE EXPANSION VESSEL LOST PRESSURE. CONTACT QUAL ENGINEER AS ABIT TECHNICAL 4 DIY`ER

PAUL MARTIN
October 2007

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