Heating is on, Radiators are switched off but still getting hot?

[Phil Smith]

Hi,

My heating is switched ON.

3x of my radiators TVR valves are OFF.

BUT the radiators are still coming ON.

I’ve checked the TVR valve and they are working, the pin is opening and closing they are ok.

It seems really odd that this problem started at once, any idea what this could be?

Thanks, Phil

 

[terryplumb]

The TRV' s are duff.

 

[Madrab]

As above ... The heads probably aren't working anymore. As a test, depending on the head type, get a decorators cap and put it onto one of the rads that isn't switching off, does it then go cold, if so you need new TRV heads.