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Sorry, meant to say old Ferroli NEVER lost any pressure with same pipework!

Hi all My boiler is 6 months old and keeps losing pressure. If I set to 1.5 bar, within 4 days it is back to zero. 1) checked all rads & pipework- no leak. 2) No water leaking outside - so not PRV issue 3) Having Expansion vessell pressure checked next week. Presuming EV pressure...