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    Need to re-pressurise EcoTec Plus 618 system - but how?

    Only been in this house few months, so haven't got 'acquainted' with our boiler yet. Back from holiday two months ago and spanner was showing and 0.4 pressure. Put on heating to test it and it fired up OK. Relief all round. Two days ago, we go dreaded F22 error and nothing was working, heating...