"cheesey_toastie" wrote in message
ups.com...
Fixed a leaky ball cock value and then drained the central heating to
clean it out as there seems to be a blockage in the downstairs radiator
(in the kitchen).

There was sludge in the header tank which has filled back up again, no
longer overflowing as it did with the broked valve. However the
radiators are not filling with water and when i turned on the hot water
the pump was dry running.

How can i get the water circulating again! I think the header tanks
sludge has caused a new blockage... though i added the chemiclas to
clean the sludge... will it unblock overnight!


Any help gratefull recieved!

My system does the same - just connect hosepipe to drain point and slowly
introduce water 'till it comes out the header overflow, then bleed rads as
normal

Regards Jeff