Faulty pressure guage?

southcoastrgi

How did he release the boiler pressure to replace the gauge  ?

Do you have water dripping from the copper pipe outside ? (Tie a small bag over it & see if it gets water in it)
If you do there lies the problem which could be linked to my 1st question 

sb29

Jeepers_Creepers said:

If that plastic pipe issues 'slugs' of water at regular intervals whilst the boiler is running, that's normal. If it does so when cold and off, that's usually a bust main exchanger - unusual.

Anyhoo, please report back when the cause is found - it's an interesting one :-)

It turned out to be very uninteresting. Two weeks later, noticed damp patches on the kitchen ceiling. It took a while for the damp patches to emerge because for whatever reason, the previous owner had put two layers of plasterboard on the ceiling. Now i am left with holes in the kitchen ceiling that I need to fix

Jeepers_Creepers

Thanks for the update! Always good to hear

On balance, that’s a good outcome - holes are easy to fix. Wanna know how?! Post some pics