Radiators cool down after getting hot?

[Basher]

So strange....

As Simon above.
I'm sorry my comments were not clear enough.
There is absolutely nothing strange about what you describe. The trv's are doing what they should.
It's physics/thermodynamics.
Don't worry - it's all working!

 

[Jurgenjay]

Nothing strange about it at all. Everything is working as it should. If you find the rooms cold turn up the valves.

Thank you! I will take it as normal then!
Just out of curiosity, you are a plumper, have you seen things like this before that all other room radiators keep warm/hot but just some rooms radiators cool down after getting hot itinially?

 

[Jurgenjay]

As Simon above.
I'm sorry my comments were not clear enough.
There is absolutely nothing strange about what you describe. The trv's are doing what they should.
It's physics/thermodynamics.
Don't worry - it's all working!

Thank you!
Yes, it works in terms once boiler starts & radiators get hot.
As this is first time I notice this kind of thing, therefore raised this question.

Basically, all other radiators keep warm as long as boiler in operation, but only those 3 will cool down.

 

[ShaunCorbs]

Remove the trv head sorted they will stay hot aslong as the boiler is on

 

[Jurgenjay]

Remove the trv head sorted they will stay hot aslong as the boiler is on

Thank you!

Did you mean remove the head of TRV like attached photos, just take that part off & no need to bother the setting is level 5 or 3?

 

[ShaunCorbs]

Correct remove that eg unscrew the silver collar and it and the head will pop off

 

[Jurgenjay]

Correct remove that eg unscrew the silver collar and it and the head will pop off

Thanks!
Before take that off, no need to bother the setting is level 5 or 3?

 

[ShaunCorbs]

It’s easier to remove when on setting 5 but not a must

 

[Jurgenjay]

It’s easier to remove when on setting 5 but not a must

OK! Thanks Shaun!