When servicing a raditor the header tank drained as the ball cock was stuck shut. The headertank now has water in it but the raditors are not getting hot despite bleeding them till no air comes out, there is also no water coming out the top bleed valves either any idears ?
Have you checked that the ball valve is still working OK?
Is the header tank still full?
If it is, you will blead all the air from each radiator until you have water spraying out.
Blead with the system cranked up to max and the heating and pump running.
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