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Have checked the trv pin and it's fine, it's all copper piping. Interesting thing, the radiator is hot at the point of entry on the feed side, but literally only the bulbous part that connects directly to the valve, there is no heat whatsoever going beyond that point. blocked return pipe could...

Having a bit of trouble identifying the cause of a cold radiator. Heating is an unvented system fed from a hot water tank. The two rads closest to the tank heat up very quickly, but then there are three more that heat up very slowly and a final rad that stays stone cold. I tried balancing the...