The TRV fell off

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Fell off, snapped off, whatever.
On the radiator by the front door. Walked past it this morning & saw it on the floor.
Nothing really should've clipped it but whatever, it's on the floor.

Would prefer to not have to call someone out to deal with this but at the same time I have been known to flood the living room before when undoing/tightening. Getting someone out is obviously going to cost but at the same time things like these can turn in to a ballache with trades folk because in my experience they're never interested in little jobs like this so you're constantly chasing trying to find someone willing to come out & sort it.

What's the process for getting this sorted to how it should be?

As in talk to me like I'm a dummy (don't just say replace it). Like do I need to be undoing the nut that's near the rad, do I just grip the metal collar thing that I think should be part of this TRV at the bottom that's still attached, do I grip the bit below it & undo that collar thing above it? Is it going to leak if so - do I need to be doing something to stop that? Etc etc etc.

20260518_194228.jpg20260518_194240.jpg20260518_194246.jpg20260519_095755.jpg

Thumbnails attached.
 
Come on mate, you can see the accumulated sludge gunk as well as I can - that sludge shouldn't be there, & there's only one place it came from.
Dont talk absolute nonsense its people like you who give this trade a bad name trying to talk up an absolute basic job .
Yeah its came from a weeping o ring on a metal pin that has started to rust pure and simple
Accumulated Sludge my ar5e
 
Poster #12,
The sludge came from the water in the installation.
Are you denying that there's no sludge?

Why the agi drama? Cant say I've ever been emotional about valves.
sludge my ar5e its a rusty pin FFS you can see the rust on the pin
 
Poster #14,
So you are denying that there is accumulated sludge? What do you think the black stuff is?
So how do you think the sludge you say is in the system got to travel to the outside of it? If sludge had been able to get through the o-ring seal around the TRV needle, then large amounts of water would have come out as well. There's just been a small seepage of water around the needle which as caused some rust to form there.
Because of that seepage, ideally the complete TRV should be replaced, but if the OP doesn't want to do that, replacing the TRV head with a new one will probably suffice, though then they'll always be a risk of a larger leakage from this valve.
 
Hell fire I didn't expect this.

Have we ever had a power flush? Yes. Can't remember when though. I'll say maybe 6 years ago?
Just to double check, the plumber was clanging & banging all the radiators. Sound like a power flush? After all this job he then installed a Magnaclean filter.

I did wonder about the corrosion in the first phot as to whether that's normal or not.

I don't know of any noticeable leak on that TRV although there are one or two rads which have that green crud around them which I think it supposed to be leakage? Again not massively so. I'll have a see tomorrow & come back here.


Regards the unscrewing as mentioned here, is it just a case of get an adjustable spanner & undo or what?

Reason I ask is when you scroll around videos & come across plumbing videos, the comments are always full of contradicting do this, don't do that & nobody agreeing on how it should be done.

Bit like this post here I suppose.

Am I supposed to hold the lower part tight while undoing that collar or should it be fine to just remove as I said with a pair of adjustables?
 

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