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My living room radiator is cold when all the other radiators are firing. I have checked all the internet YouTube advice feeds. The trv is working correctly, the lockshield valve is also working and I have taken the radiator off and flushed it through and have bled it. I believe it is the furthest from my combi boiler. I have turned all my other radiators off and this makes the living room radiator work, but as soon as I turn one other radiator on the living room one goes back to cold. Any further DIY advice would be much appreciated. Thanks Jason