thanks for your replies, however found the problem, i need to replace the 3 way motorised valve activator, all my rads are now warm as the setting is now on manual until i can get it changed. for your info brumylad, i have a header tank in the loft, the system is fairly old but the boiler and...
turned the heating on the other day as usual but found no heat going to the rads, plenty of hot water from taps though. called a plumber basically did a few checks etc said it was a blockage but was pretty vague, drained a few rads, but upshot was, he left and i have only two rads working in the...