Stuck Domestic Thermostatic Radiator Valves.

[Ianinessex]

Originally Posted by macabethiel

So do I need a small screwdriver inserting between black plasic bit and the bottom of the white knob to prize it upwards with the valve in the open position then ?

It is best with the knob in the fully open position as that is putting no pressure on the valve.
As to exactly how to remove the plastic thermostat, I do not know and can not see from the picture. Some have a screw fitting, some a sliding collet and I think some just clip on. All I can suggest is gentle twisting and/or levering at the point it joins and see if something moves. You will be looking for a movement that releases the grip of the collet "teeth" onto the valve.

[terrano bob]

Originally Posted by Ogri

I'll just add a word of caution when trying to free the stuck pin: If, like me, you are not a plumber but a ham fisted oaf, it is possible to pull the pin completely out of the valve

This leaves you with a broken valve and a leak that in my case couldn't be fixed without draining the system down

So, just go carefully with those pliers/grips...

absolutely bang on there ogri