Cold Radiators!!

tomo658

I have a few radiators in my house that only come on and get hot when I unscrew and take off the TRV sensing head. Is this as simple as I need new sensing heads? Any help appreciated!

Grenage

Yes, the heads will be stuck. If you lift the cap off and give the little metal stem a tap, it can often free them up.

Alex1983

If they are working with the heads off then the heads have broke. If your replacing with the same heads you can just replace them without changing the complete valve.

tomo658

So it wouldn't work if I just bought this from screwfix and replaced the head?
https://www.screwfix.com/p/drayton-trv-sensing-head-rt212/3279r

The head in the link is almost identical to the ones I've got but mine don't have any branding on them

Alex1983

Yes if you have Drayton valves they will be fine.

If you get the faulty one and remove a working one, put your finger inside the trv head and turn it on and off you will feel the good one move in and out. The faulty one will not move and be stuck in the off position. It’s quite common with the Drayton heads.