Drayton stiff TRV - can't turn off completely

[Capejasmine]

Hi mcmillanandrew,

In the end I had to replace the TRV head with a new one, so I suggest you try that first before getting a plumber, it might save you a small fortune
Good luck, let me know how you get on.

 

[DirtySteve]

Sorry old thread but I’ve got the same problem.
I’ve got Drayton TRV 4’s and one isn’t switching the rad off. It’s in a room with 2 other radiators and it’s the only one not switching off so I don’t believe it’s frost protection.
I’ve removed the plastic head and the pin is stiff but using something hard it does press in. A previous poster mentioned replacing the head. Is that just the plastic top or the chrome body with sensor head. I wouldn’t know where to start in replacing that as I assume the rad would need draining first.
Anyone fixed a Drayton TRV 4 not switching a radiator off?

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Please start a new thread otherwise people have to read 3 pages of old stuff before seeing your question
Mod
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[CBW]

I know you apologised for resurrecting an old thread, but it’s nearly 11 years old! Better to start a new one.

If the rad isn’t shutting off, I doubt replacing the head will do anything. You either need a new valve, or there’s a stop that needs removing.