Very slow drip from combi-boiler

[mac456]

Hi Guys,

I've just noticed a very slow drip from the pipe under my combi-boiler. It seems to be coming from the pipe which connects to the filling-loop. Any ideas? and is it worth calling out a gas engineer?
I did read an article about bleeding the radiators to release some pressue?

Sorry about the spelling mistake "the are" in the picture (was rushing)

Thanks

 

[muggles]

You only need to release pressure if it's too high. Looks like the nut just needs tightening up, or the washer needs replacing, but it might be coming from higher up. Worth getting it checked out

 

[DP]

Me thinks it is coming from higher up as screw is marked as if there has been water on it

 

[mac456]

Thanks guys, I just had it serviced about 3 weeks ago and all was reported fine...
I put a cup under it over night to see how much it drips, not a single drip.

Am I allowed to try and tighten this bolt or is it only gas registered engineers that can touch it? Just trying to avoid a callout fee when I have only just paid them to come out and see it...