Radiator has me boiling...

digannio

In this day of soaring energy prices I'm on a mission to sort out all the radiator TRVs. Mission accomplished bar one which won't play ball. I've set this one to 0 as it is an often unused room but it has now decided to heat up whether it's on 0, frost setting or any number between 1 and 6. I just want it to obey when it's on 0 and stay cold when the central heating's on. Any ideas? Also if it involves getting at the inside to perform tapping on some spring or other, how do I get this plastic cap off? Idiot's guide would be welcome. Hoping if possible to avoid one of them expensive plumber-type gadgies.

BUFF

looking at that I would suggest trying to rotate the knurled ring to remove the head. you can then check if the pin in the valve moves.

digannio

May sound basic but is it guaranteed that can't lead to a faceful of water?

marcia_

BUFF said:

looking at that I would suggest trying to rotate the knurled ring to remove the head. you can then check if the pin in the valve moves.

 Yup i had to do this. Unscrew head then tapped the pin to unstick it then it worked fine

elsien

digannio said:

May sound basic but is it guaranteed that can't lead to a faceful of water?

A diyer after my own heart.  

digannio

I'll give it a whirl but may leave until daytime tomorrow when 999 plumber help may be easier to get should it not go quite as planned

coffeehound

Hullo @digannio, yes you will be fine undoing the ribbed nut.  Should then expose a metal pin that moves in/out to close/open the valve

marcia_

digannio said:

I'll give it a whirl but may leave until daytime tomorrow when 999 plumber help may be easier to get should it not go quite as planned

  No water promise, its just a pin underneath wouldnt pay a plumber till I'd tried that

http://www.handymanknowhow.co.uk/plumbing/radiatorsnotheatingup.htm
Describes how to do it 

digannio

Is that no water, I promise or no water promise? There's a world of difference

marcia_

 😂😂🤣 i promise no water so long as you only take off the top and leave the nuts alone 

Belenus

digannio said:

Is that no water, I promise or no water promise? There's a world of difference

If water was leaking past the pin you would already have a visible leak as the white plastic TRV head is not water tight.

I have removed an number of TRV heads and never had a leak.

When you unscrew the knurled collar, make absolutely sure that no part of the metal valve housing to the right of it moves.