Same problem as jimG but i have tried all the advice for him to no avail.
My radiator is the farthest away from combi boiler,had no problem last winter at all. turned it on this time nothing ,bled it, half went warm then cold again! had to top up system! only water no air came out. All radiators have thermo controls on except this one and one other. I feel that i have tried everthing ANY IDEAS?