Leaking radiator valve - downstairs living room

[DIYNovice1979]

Hi,
My heating was working fine, but I've recently discovered a leaking radiator valve in a downstairs radiator.

It's a very slow drip. So far, I've just turned the heating off and screwed the top square part of the radiator all the way down. I've also screwed down the valve on the other side as well.

What's the best way to fix a slow leak? Do I need to drain the whole system?

Thanks in advance

 

[jj4091]

Try nipping it up a quarter turn

 

[Dereekoo]

Has your action stopped the drip? Depends on system, pressurised or gravity, but both doable without draining down but try above advice 1st

 

[CountryFan]

Looking at that seems like it’s coming from the top part of the valve and running down?

 

[Alec_t]

^ Agreed. The water stain on the valve body suggests the valve stem seal is the likely culprit.