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I have tried everything to fix a single cold radiator which has never worked since I moved in Changed the rad, the TRVs, removed some isolating valves I found on the spur. There is flow to the rad ( the flow pipe gets hot), there is flow on the return ( the system drains successfully...

Today after running the system for a few hours, I got all the proof I need. The return flow pipe, below the isolating valve ( the rad side) was lukewarm, and the temperature of the flow pipe above the valve ( the boiler side) was significantly hotter. The valve, even when open, is...

Yes I confident that there is good flow to it - it feels burning hot, and due to a plumbing accident earlier today, there was quite a spectacular spray from the flow pipe - now fixed). In a moment of inspiration, I have tracked down where both flow and return rise from under the floor and...

Newb - please bear with me - I use this a lot for reference and advice, but first question. I have one radiator that refuses to get anything more than luke warm. I just spent most of my Sunday replacing it with a new one and new TRV and lockshield - with only marginal difference. Let me...