Air in boiler stove circulation

Joined
10 Oct 2012
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Location
Durham
Country
United Kingdom
Hi

I have a back boiler multi burner stove. I have been bleeding the system for ever and sometimes air comes out and other times it doesnt.The system doesnt sound like it has air in either.

Usually when I have the boiler on max then after it cools the next day I bleed the radiators above it and sometimes air comes out other times doesnt.

Does anyone know the best way to flush air out the system? Or out of the back boiler, could be trapped in there as before I heard dripping noises.

Now, even stranger. To try push air out of my back boiler i closed off all radiators except 1 upstairs, where i sometimes get air out. When this was done I turned on the pump, ran up stairs and started bleeding the radiator. At first a little air came out follower by some water, then strangely it decided to suck air in ( I know this as I had my finger over) What would cause this??

Im at whits end with my stysem. Has anyone got any ideas apart form get a professional

Thank You
 
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