@@stevenroberts8671 I got a really strange issue. I remove the cover and it was dry, waited a few minutes and not a single drop fell. After heating is on, the condensate pipe drips but only for a little and then stops but the pressure in boiler drops ever so slightly. I'm confused as to what it could be. The prv is dry but the expansion vessel was charged 4 times higher than required. At almost 4 bars instead of the recommended 1. I have released some air and so far it's got better but still pressure drops a little. But again sump is dry and no drips from behind cover. It's definitely not the radiators or pipes either.
