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Mend Air Lock Out Heating System

How do I get an air lock out of my heating system?

I've just drained my system to fit a new radiator. Water has stopped coming out of the drain valve but the header tank is still full. I opened all the air valves on the radiators and nothing is coming out of any of them so I am assuming that the radiators are empty.

Mark
September 2008
Heating, Home Heating SystemsAir Lock Out Heating System
have u got any zone valves fitted if so try manually opening them

Mark
September 2008
you have a blocked cold feed.

hi-spec plumbing & heating (essex)
September 2008

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Heating System Air Lock - How to Bleed Radiators