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Many thanks . I have tried that to no avail . . I think i t may be the valve itself. . . . .Is this changeable without draining the whole system ? ? ? ?

I have just tried that . . no joy, however i have also screwed the thermostat head off and when the valve is fully open it now seems that the "pin" isn't moving.. When the other rads are off i cannot hear any water flow into this rad like i do on the others. This radiator was fitted after...

Yes . . I've tried closing and re-opening that valve and nothing happens . . . . . .

I have a radiator in my conservatory which does not heat up. The thermostatic valve gets hot but no matter how far i open the thermostat the radiator does not heat. I have checked the Thermo valve and the pin inside seems to be going up and down with the control knob. Any suggestions as to...