Why are two of my radiators boiling hot despite the thermostatic controls being turned to '0'?

9 replies

Spliffle · 05/12/2022 21:47

They're only a year old, both the rads and the thermostatic control valves. I only want to heat one room, not the whole house. I'm wasting heat. Why are these rads hot? Please @Pigletjohn (hoping for the guru himself)

OP posts:

PigletJohn · 05/12/2022 22:02

Please show photos of the valves at both ends of the radiators

From above and from the side.

Savoretti · 05/12/2022 22:05

I’d be interested in this too as I find the same problem

Hooveslikejagger · 05/12/2022 22:11

Me three, I have this issue too

Original poster

Spliffle · 05/12/2022 22:22

pics

Why are two of my radiators boiling hot despite the thermostatic controls being turned to '0'?

OP posts:

Original poster

Spliffle · 05/12/2022 22:23

It's hard to get a side photo as the rad is set into an alcove

OP posts:

larkstar · 05/12/2022 22:40

Just check the thermostatic valve is actually screwed on to the thread on the body of the radiator - turn the knurled part clockwise just to make sure it is screwed down and not loose. When you turn the radiator valve from 0 to 5 it winds out and lets a pin in the centre of the valve out to allow the hot water to flow into the radiator. By turning the valve in so it goes from being set on 5 to 1 for example, should push this pin inwards reducing the flow of hot water into the radiator. You might find that you have a plastic cap that you can screw onto the radiator inlet if you completely remove the termostatos valve - this should turn the radiator of because it should push the pin completely in. Sorry - it's really simple to do but hard to explain.

Shouldbeworkingnotreadingtalk · 05/12/2022 23:01

Is your hot water on? Sometimes people set their systems up so some radiators heat accordingly to the water being on.... took me 4 years to learn this little gem

Potato28 · 05/12/2022 23:03

Is the hot water connected to certain radiator's?

PigletJohn · 06/12/2022 04:06

When fitting or tightening the heads, turn them to the hottest number first, so they are not pressing on the pin. Once fitted, you can turn them down. I can't clearly see if they are tight.

You can also adjust the lockshield valve at the other end to reduce the flow. It looks like there is a protective cap that would unscrew, but again I can't see it clearly. Underneath, there is probably either a spindle, or a hole that a key fits into.

I don't recognise the make. Are there any names on them? Do you know where they came from?

Flip