Check to see if there is a room stat and if its calling for heat , if not turn it up. Otherwise check circulating pump is turning sometimes they stick and need a helping hand to move again by opening front and rotating shaft with small screwdriver.
plumber
November 2009
check for motorised valve see if it openes on request
anto brandon
November 2009
I can answer this question...
the radiators not hiting but hot water it is what can i do?