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If it's not a greenstar boiler (condenser) then the filling loop is letting by. No other explanation.

Loads of things can cause EA fault.The installer should check CO/CO2 and other obvious things. Then pass back to worcester.

All modern boilers are a pile of crap, how they can claim to be green with all the time money and energy needed to make the parts and do the repairs i'll never know. The price they charge for some parts is near criminal vaillant being one of the worse. Worcester parts are one of the...