Radiator stuck on hot

[Wonderhorse]

I have a radiator that is stuck on hot. The knob turns correctly, but it just stays hot.

Any help would be appreciated.

Thanks.

 

[PrenticeBoyofDerry]

Give the pin on top of the valve, a gentle tap, it is likely seized in the on postion. The pin should move up/down when the TRV head control knob is turned.
So if you try to press the pin and it does not move, it needs some gentle persuasion to free it.

 

[ianmcd]

The top of the thermostatic valve looks as if it has popped out, do all the others look the same ? as Prenticeboy said above the pin may be stuck and could have pushed the top part out of the valve, it may just be the design but all the ones that I have seen have all been flush.

 

[Wonderhorse]

Thanks for your replies.

The pin is stuck hard, should I be able to push the pin down with my finger?

 

[PrenticeBoyofDerry]

Thanks for your replies.

The pin is stuck hard, should I be able to push the pin down with my finger?

Yes you should be able to push the pin down, then it should spring back up. So a gentle tap with a lightweight hammer/object could be needed. Don't hit too hard. Then try a bit WD40/lubricant on it.