Hi I got this fitted during the summer last year and since approximately October/November the pressure slowly rises from 1.2 to 1.8 then I drain it back down, have had the filling loop disconnected for a couple of days twice now and no drips so ruling that out, so the only other thing I would think it could be is the heat exchanger but on a new boiler ?. I know that this model gets bad reviews but I got it fitted for free as an energy grant and I have been out of the loop for a few years now, any ideas before I call them up ?
Thanks
Thanks