I have a chrome TRV in the bathroom which isn't working - that is, it
won't turn the valve off even if set to frost protect.

As an interim test I've swapped it with the one from the downstairs
bathroom (no idea if this one works OK) but if the head of the TRV is
duff, I would be looking for a replacement.

Looking back (via Homeowners Hub mea culpa) I see that most TRV heads are probably interchangeable.
So far so good.
However how do I confirm the brand and model.?
These look like Drayton TRV4 Chrome but I can't at the moment see anywhere
on the TRV head with a brand or model number.

Any obvious way apart from they look like the picture?

I will have to hunt around in the plumbing pile of bits to find a
decorator's cap to confirm that the valve is shutting off.

Cheers



Dave R

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On 18/04/2025 13:29, David wrote:

I will have to hunt around in the plumbing pile of bits to find a
decorator's cap to confirm that the valve is shutting off.

The pin in the body could be stuck or the head not completely seated. If
the head is not completely seated downwards the expansion capsule in the
head will have insufficient travel to push the pin in the body fully
downward to switch off the valve.

Take the head off to reveal the pin in the body.

You should be able to move the pin down by a few mm and it should spring
back

https://www.youtube.com/shorts/bUD57-lfGyI

Note: Twist the head to the maximum setting before fitting it back on to
the body. On some TRV the head needs to be pushed down firmly before
tightening it up with the screw ring.

If the radiator is hot it may take 30 minutes to cool after switching
off the valve.

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On Fri, 18 Apr 2025 13:53:57 +0100, alan_m wrote:

On 18/04/2025 13:29, David wrote:

I will have to hunt around in the plumbing pile of bits to find a
decorator's cap to confirm that the valve is shutting off.

The pin in the body could be stuck or the head not completely seated. If
the head is not completely seated downwards the expansion capsule in the
head will have insufficient travel to push the pin in the body fully
downward to switch off the valve.

Take the head off to reveal the pin in the body.

You should be able to move the pin down by a few mm and it should spring
back

https://www.youtube.com/shorts/bUD57-lfGyI

Note: Twist the head to the maximum setting before fitting it back on to
the body. On some TRV the head needs to be pushed down firmly before tightening it up with the screw ring.

If the radiator is hot it may take 30 minutes to cool after switching
off the valve.

Thanks, but I have done the initial obvious things.
Pins move on the upstairs and downstairs.
I have followed procedure removing and replacing the TRVs.

What I really need is the two questions posed in the OP answered.

Regards



Dave R


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On 18 Apr 2025 12:29:59 GMT, David <wibble@btinternet.com> wrote:

I have a chrome TRV in the bathroom which isn't working - that is, it
won't turn the valve off even if set to frost protect.

As an interim test I've swapped it with the one from the downstairs
bathroom (no idea if this one works OK) but if the head of the TRV is
duff, I would be looking for a replacement.

Looking back (via Homeowners Hub mea culpa) I see that most TRV heads are >probably interchangeable.
So far so good.
However how do I confirm the brand and model.?
These look like Drayton TRV4 Chrome but I can't at the moment see anywhere
on the TRV head with a brand or model number.

Any obvious way apart from they look like the picture?

I'm not an expert but I've never bothered to try and replace any TRV
with what was there before, I've just bought what was most convenient
at the time, usually Screwfix or we have a plumbing merchant up the
road.

They strike me as being fairly simple devices (assuming not internet
connected) that just allow controlled movement of the pin in the
valve.

I will have to hunt around in the plumbing pile of bits to find a
decorator's cap to confirm that the valve is shutting off.

I thought they were only decorative on the balancing side of the
radiator and they are on the opposite side of the temperature valve.
I've used pliers to adjust those making note of the initial position
first just in case.

Hopefully an expert will come along and clarify/confirm everything.




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AnthonyL

Why ever wait to finish a job before starting the next?

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On 18/04/2025 22:37, Roger Mills wrote:

There are at least two different thread sizes used on different makes/
models of TRV. When, for example, you buy a Hive smart radiator valve to replace an eixting TRV head, it is supplied with adapter rings - and you
have to select the correct one to fit the wet part of your valve.

One of te other smart radiator valve manufacturers also confirms this by
saying their heads "fit almost any valves directly or with adapter" and
supply 4/5 different adapter rings.

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On Fri, 18 Apr 2025 22:37:44 +0100, Roger Mills wrote:

On 18/04/2025 13:29, David wrote:

<snip>

If your TRVs are genuine Drayton TRV4s, it will say so on them. But
there are also generic copies on the market which are unmarked but
should be compatible.

Perhaps that is the answer.
They may be copies.
Anyway, generic one ordered as the fault moved with the TRV.

Cheers



Dave R

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On Sun, 20 Apr 2025 18:14:11 +0100, Pamela wrote:

On 15:38 18 Apr 2025, David said:

On Fri, 18 Apr 2025 13:53:57 +0100, alan_m wrote:

On 18/04/2025 13:29, David wrote:

I will have to hunt around in the plumbing pile of bits to find a
decorator's cap to confirm that the valve is shutting off.

The pin in the body could be stuck or the head not completely seated.
If the head is not completely seated downwards the expansion capsule
in the head will have insufficient travel to push the pin in the body
fully downward to switch off the valve.

Take the head off to reveal the pin in the body.

You should be able to move the pin down by a few mm and it should
spring back

https://www.youtube.com/shorts/bUD57-lfGyI

Note: Twist the head to the maximum setting before fitting it back on
to the body. On some TRV the head needs to be pushed down firmly
before tightening it up with the screw ring.

If the radiator is hot it may take 30 minutes to cool after switching
off the valve.

Thanks, but I have done the initial obvious things.
Pins move on the upstairs and downstairs.
I have followed procedure removing and replacing the TRVs.

What I really need is the two questions posed in the OP answered.

Regards Dave R

Were you the poster many months ago who suspected their TRVs caused a clicking sound?

No



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On Fri, 18 Apr 2025 12:29:59 +0000, David wrote:

I have a chrome TRV in the bathroom which isn't working - that is, it
won't turn the valve off even if set to frost protect.

As an interim test I've swapped it with the one from the downstairs
bathroom (no idea if this one works OK) but if the head of the TRV is
duff, I would be looking for a replacement.

Looking back (via Homeowners Hub mea culpa) I see that most TRV heads
are probably interchangeable.
So far so good.
However how do I confirm the brand and model.?
These look like Drayton TRV4 Chrome but I can't at the moment see
anywhere on the TRV head with a brand or model number.

Any obvious way apart from they look like the picture?

I will have to hunt around in the plumbing pile of bits to find a
decorator's cap to confirm that the valve is shutting off.

Brief update:

New generic TRV from Amazon.
Fitted and working fine.

Haven't bothered testing until now because the CH has been off, but
yesterday was chilly so I turned the heating back on.

Cheers



Dave R





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