Radiator doesn't heat up

[diy_massacre]

Hi all,

Sorry for the basic question, but one radiator in one my new ( old house ) house doesn't heat up, its a 15mm pipes but the rest of the system is on 10mm so it has reducers close to the rad. I have opened the taps fully and notice that the left-hand side pipe is warm, when the heating is on, but not the radiator. I have bled the rad tap and get no gas, only water.

Any ideas or actions?

Thanks

Diy_m

 

[ShaunCorbs]

Remove the trv head does the pin push in (easy) you can use the top of the head?