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Looking at a diagram on line its the automatic air vent,any thoughts?

Spoke too soon just checked and there,s water under boiler!!! It was leaking after engineer finished but he traced it to some "valve" that is only open on commisioning so he closed that and it stopped.Cant see now where its coming from as cover is back in place.Oh well have to call him back again!

Engineer came this morning,drained boiler and checked EV pressure it was just under a 1 bar so all ok.Drained towel rail and put in 1 cartidge of inhibitor.Recharged system and fired up boiler,running at about 2 bar.Can,t see any leaks in boiler or from PRV so hopefully it will hold pressure...

Thanks Ian for prompt reply.I will contact engineer asap.

Well! Now here,s a thing boiler held pressure overnight,fired up this morning no bother.It has a running pressure of 2.2 bar does this sound about right?Also would I be right in assuming that because of this:A)there is no leak in the CH system B) the Epansion Vessel doesn,t leak.The only other...

Thanks for all info guys,will get engineer(hopefully)to invedtigate tomorrow and will report back.

Thanks Ian yes when boiler is running it is close to 3 bar.Does this mean expansion tank has an internal leak or that it needs repressurising? Regards Keith

Hi I have a 10yr old Alpha cd28c boiler that has given faultless service until last week.No hot water.Engineer diagnosed faulty diverter valve and motor.This was replaced and all was well for a day!Then the boiler would lose pressure over the 24hr period and would not start up until water was...