You need to give information about your system - type and model of boiler, hot water side (combi or tank), what controls (motorised valves, etc.) is rad problem with all rads or just some, etc.?
Take that radiator off flush the debris out of it and run some water out through each rad valve in turn to clear the debris / sludge from the pipework.
thanks all for your advise.i was advised to turn all rads off except the one that did not work and run the heating this seems to have cured the problem now sitting here sweating!
thanks again for your advise
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