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One Radiator not heating

Hi All,

We renovated our house in 2019 and put in completely new plumbing system and piping including new boiler and 9 radiators. Off those, there is one radiator in the living room which does not heat up at all. I have tried balancing myself and also had a professional come in to balance it but the radiator just won't warm up like the other 8 do. It is possible it may be the last one in the flow, but I have tried turning off all other rads and yet it refuses to heat up.

I have checked the lockshield valve and they are both fully on. One valve (which I assume is the flow) is burning hot, while the other valve remains cold.

My question is could this be a case of blockage in the radiator? If so, do I need to do a complete power flush or simply flushing the radiator in question would be enough? Any experts out there who can help? (Note: I am not a professional and will need professional help to get either of the tasks done). The original installers have suggested doing a complete power flush (they are charging £800 for that), while another one suggested flushing only the radiator in question. Any advise and pointers on this will be greatly appreciated!

many thanks,
Ash
 
Have you tried waggling the pin on the trv?

Is it possible it’s been plumbed in with two flows instead of a flow and a return - this happens more often than you would think possible!

Can you trace the pipework to check this?
 

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