Can I adjust a Thermostatic Radiator Valve?

[jabberbabber]

We've had to turn off this TRV because even if we set it to the lowest setting of 1 the room is too warm. Is there a way to adjust it so that 1 is cooler?

Hello,

Not sure at adjusting it but I believe you can now get digital thermostatic valves put on instead, we are looking at doing this in our nursery so we can regulate the temp better.

Is the radiator still getting hot when it's set to the low settings?

It is cold when set to 0 or * as it should be, and too warm when set to 1.

use a thermometer please to find out what temperature "1" is when it is still "on"

is for frost protection only, for example an unoccupied room. At you are likely to get damp.

Can you see a makers name anywhere?

When you turn it from hot to cold (slowly) does it make a rushing noise just before it shuts, and shut with a click or a thud?

Has the head ever been removed? Is the fixing ring tight? If you ever need to remove or replace the head or tighten the ring, turn it to its highest setting first, to remove pressure on the valve pin.

p.s.

And please photograph the valve at the other end.

Our Worcester boiler has a radiator temp setting (although that applies to all of them of course)

Does yours? It goes from like 1-6, with an e setting at about 4.5. The highest setting is too high really.

@PigletJohn here is a photo of the other end (it's green because it's been a little leaky in the past so we've had to tighten it).

For context, the room is a converted loft, so well insulated. I haven't measured it with a thermometer, but in this weather, when the radiator is off the room is probably around 16 degrees, but if the radiator is on its lowest setting of 1 it feels around 21 degrees. We would like it to be around 18 degrees.

When the radiator comes on it makes a faint rushing sound, bordering on a whistle. When I turn it off the noise stops - I don't hear any click or thud.

We've only lived here a year and haven't done anything to this radiator (though we've had several other radiators replaced).

You say the lockshield valve is leaky so you need to replace it with new. If you try to adjust a leaky lockshield it will leak more. You can usually stop the leak by screwing it all the way open or all the way closed. A good quality valve should last 20 years without leaking, unless you keep manually turning it and wear out the seals.

Once replaced, you can reduce the output of that radiator by screwing the lockshield shut, then opening it about half a turn. Wait half an hour then if necessary adjust it by no more than a quarter turn. All the adjustment on a lockshield is done when it is nearly closed. Don't adjust it more often than once in half an hour, nor by more than a quarter turn at a time. When you are satisfied with the adjustment, put the plastic cover over the spindle and retain it with a screw if it has one.

I suspect your TRV is on the wrong end so you may as well change that too. You can buy a new TRV and lockshield as a pair.

IMO the RAS C2 is a very good, and neat one.

Thanks PigletJohn. It sounds like a job for a plumber, yes? Will the radiator need to be drained?

yes.

but probably not the rest of the system.

Identify which pipe on the radiator gets hot first. This is the "flow" side. The person fitting the new TRV needs to know.