Radiator not turning off if hot

[MenBehavingBadly]

Hi all

One of our radiators is behaving oddly.

When it's hot . We can't turn it off with the valve. I.e. turn to 0 and no effect

With the valve at 0, If we turn off the heating , let everything cool down and then turn it back on then the rad stays off

Any ideas? The thermostatic head is myson (we've tried 2 different heads) and the valve itself is altec I think. Weve used myson heads on some of our other rads and they work ok with the altec valves

Any ideas?

Thanks

 

[StudWall]

pretty much sounds like it must be the valve body getting stuck fully open and closed

 

[ianmcd]

Replace the TRV with a complete new valve and head, not a good Idea to mix valves and sensor heads

 

[MenBehavingBadly]

Ok thanks