worcester bosch outlet pipe leaking?

possibly your expansion vessel. does it rise to 3 bar on central heating mode? if the boiler shows 1 bar and heating isn't on and then rises to 3 bar on its own then your filling loop is open or if not that there is a cross leaking situation within the boiler.
worcester charge £210 for a visit and fix whatever the prob.

paulplumber
November 2009