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Right, here goes. The boiler is a Worcester Delglo. It is situated in the airing cupboard and in effect, the burner is situated directly under the hot water tank. There is a header tank in the loft and is at its normal level. The pump, next to the boiler, is working. As I mentioned, there was...

Thanks for the advice, it is what I expected but I am still somewhat confused. I obviously have a rad in the bathroom that does not have a trv and this is the same in the en suite. They tend to react the same. Should I replace the trv's on the other rads, draining the system completely. The...

when 1st switching on my heating his year some rads did not get warm. I have thermo valves to most rads. When I switched off all rads except furthest one, thinking I had air lock, rads in lounge got hot. When I opened valves, rads cooled. All rads bled no air. I do not know what is wrong. Are...