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central heating?

the upstairs rads are hot but no water is coming out when being bled. every so often i will get a bit of air coming out any ideas please THIS IS A NORMAL CENTRAL HEATING SYSTEM
premierefc, December 2006
on the solenoid the lever below has no tension this is auto and manual the lever is just swinging free has this come off the cog

premierefc, December 2006
souns like it has an airlock

hi-spec plumbing, December 2006