is it a trv valve?.One where you twist top to set temp?.If it is unscrew top and you might find pin stuck down.If it is gently get 2 spanners and tap the valve body 180 degrees apart and hopefully pin will release allow warm water to flow.This isn't a permanent fix as the valve may need replacing but will get the rad up and running if you leave it flat out
A1
February 2012
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