Hello I have noticed my boiler is leaking from under. It is a logic combi 30. It is leaking from what looks like a round rubber piece under it. Have tried to take photo as best as I can
From the photo it looks like there's a leak from one of the copper pipes (which is pretty crusty so has been leaking for a while). I'd start by nipping that up a bit. Not too much or you may crack the brass, but it's a compression fitting and when they leak, it's because they're not tight enough. If it still leaks after that, post another (better) photo with an arrow pointing to where the drips are actually dropping from.