Damp issue-from pressure relief outlet?

[Easterlywind]

Hi

I have had the boiler replaced about 4 years ago, it is located in the kitchen. Recently the kitchen wall has become damp and the paint has started peeling, I am not sure why. There is a pipe on the outside wall that bends back towards the wall, on googling I have found out that it's a pressure relief outlet from the boiler and i'm wondering if this could produce enough water to damage the wall (there is damp and moss starting a bit above the pipe and all the way down the wall so it seems likely that this is the culprit, although i have never seen it actually leaking).

Has anyone had a problem like this in the past? My main concern is understanding where the damp is coming from as it's really not obvious so would like to know if it sounds likely that the pressure relief valve could cause that amount of damage!

Many thanks

It sounds more likely that something above the pipe is causing the damp and the wettest part of the wall is where the moss is thickest. Have a look outside when it's raining and see whether there's an issue with overflowing or leaking guttering.

Photograph the wall please.

Include the whole wall, all the way up to the gutter. If there is a bathroom above, look in the WC cistern. Is it unexpectedly full?

What the pressure gauge on your boiler read

• cold?
• fully hot?

You can tie a rag or plastic bag round the prv pipe on a dry day to see if it is dripping.

Make sure your filling loop is closed, there should be a little tap/lever valve at each end of the braided hose

Thanks you everyone.

We have spent the week looking into your suggestions above (fortunately we had both rain and dry weather) and it appears that the problem is coming from the gutter. I think we became so convinced that it was the pipe that we missed the obvious.

Many thanks, so relieved it can be sorted out before it causes more damage!