Leaking auto air vent

[dave180]

Hi all
My combi boiler's auto air vent is leaking again. I fitted this one about a year ago, how long do these things last? I'm now wondering if it's just some debris or does this mean the system needs cleaning, how do i know if it does? Is there any information you need to have a better idea?
Thanks

 

[GQuigley67]

sign of expansion problems and corrosion, will probably need recharged or replaced

 

[GQuigley67]

will probably need looked at by an engineer

 

[Mbear]

Dirt usually ruins the AAV's

 

[Bobdisk]

Mine was always leaking water, so I took it out and replaced it with an ordinary manual bleed off a radiator. For the first week I checked if any air was there by cracking it slightly, and I watched the pressure every day, and still keep an eye on it. Its now steady at 1.5 bar cold, 2 bar hot. That was 2 years ago. Its a Baxi 130HE Combi. (Waiting for comments!!)