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I tried turning off the valves and not had any obvious joy. However I took off the lock shield end and drain the rad proving I guess we do not have a through put as the trv end was open. However once I put rad back together for the first time the trv end pipe was hot, this is a step in the...

Thanks Jordan. We have an unvented cylinder not quite sure what you mean in terms of turning off the cylinder, sorry! Chris

Thanks both. The lock shield valve is open and I have given the trv valve a good tap but sadly no joy. Forgive my ignorance but i am a little unsure. What you mean when saying to remove lock shields? I was convinced it was not connected to hot water loop originally but I opened the drain nut...

Just moved into a new build that has sat empty got two years. We have two radiators that have hot water supply but have never been hot. I have had both TRV valves off the radiators and both pins come up. My only thought is that the internal gubbings of the TRV that actually do the job...