air in boiler

Joined
27 Jun 2006
Messages
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Location
london
Country
United Kingdom
every time my boiler fires up i hear air in the boiler gushing round.after a few seconds the noise stops.ive bled the radiators which seem clear of air but am wondering if there's air in the boiler and the automatic air valve isnt working.i had a look at the valve and noticed that it didnt have a cap on.was wondering if it should coz in the parts catalogue they do
 
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Not all aavs have caps on them.

I have tried using my crystal ball but cannot find your make of boiler and type of system you have
 

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