Leaking end feed air vent

[Diyattempt]

Hi everyone,

I hope members of this forum will be able to help.

The end feed air vent of my central heating system has suddenly started leaking. I usually leave it in the open position and there was no issues until today.

It seemed as if there was some gunky material that oozed out from the air vent and deposited on the vertical pipe (this may not be visible in the photo as I wiped clean the area).

I have closed the air vent and this stopped the leak.

But I realise that there are underlying issues which need fixing.

Is the end feed vent faulty and does it need replacing please?

What is the cause of the gunky material that oozed out please?

Could other faulty part of the heating system cause this issue?

Many thanks

 

[Harry Bloomfield]

I have closed the air vent and this stopped the leak.

They do often leak, and should only be opened during the initial bleeding process.