try bleeding rads or removing flushing out manually.if still no joy turn ones upstairs off to see if they come.warm .if so turn one by one on upstairs.then turn down return valve on rad to balance system if still no joy possible pump failure
paddy
January 2010
They need bled,get a bleed key and open the valve at the top gently until all the air is out and water starts dripping from it.
Rich
January 2010
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