Hi on entering the loft I noticed a small pool of water under the boiler , on looking it’s not leaking from any of the copper pipes I see under the boiler but I see it drip from the edge of the cover at bottom of boiler so must be inside somewhere , there was no pressure I opened refill valve to add a little pressure it then showed pressure in the dial , however it did nothing the screen keeps flashing con I tried turn off and on few times and reset boiler but it just doesn’t do anything any one any idea on issue I just wanna know any info before I call out an engineer tommorow ? Thank you