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My radiotor gets cold after 10 minutes

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Margie

One of my radiators which is the biggest one in the living room gets hot at first and I can hear the water flow but after 10 minutes the water flow stops and the radiator gets cold. It has the trv valve and I have to put it close to 4 in order for the water flow to start. The retun valve is open all the way
 
Try removing the trv head
 

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