I had to drain my heating system down. Turned water back on, but system doesnt seem to fillup, cant bleed radiators because no water is filling them,

trevor, February 2011

There is most likely a blockage in the t piece where the supply from the expansion tank feeds into the system (should be near the pump). If possible you need to access this pipework to unblock it, either undo a fitting if there is one and poke the sediment out for a temporary fix, or cut it out and replace the lot.

boiler bill, February 2011