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Air lock?

Recently drained system to replace Grunfos pump. system was then refilled, however the headertank (loft) for the heating system has not refilled leaving me without heating. All radiators have been bleed, and are now empty. I have bled the valve in the loft but still no water feed. Mains have definatly been switched on as I have pressure on the water system. Any ideas please?
wicksy_64, October 2009
Thanks guys. Valve replaced and now working correctly.

wicksy, October 2009
give the ball valve a good wigel, the oftern stick as they dont move much.

erj, October 2009
Replace the valve in the flow and expansion tank...you need a type 2 valve, costs around a fiver.

John, October 2009