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Correct me if I'm wrong, but the lockshield valves look like this:
If so, these are open a couple of turns at most.
The TRV valve:
This is open less in warmer rooms and more in colder rooms.
Yes, there is definitely no air in system as I worked from downstairs i.e. closest radiator to the upstairs furthest radiators.
Hope this makes sense.
![Lockshield-Valve-Header-768x512.jpg](https://sf.ezoiccdn.com/ezoimgfmt/www.wonkeedonkeetools.co.uk/wp-content/uploads/2019/10/Lockshield-Valve-Header-768x512.jpg?ezimgfmt=rs:362x241/rscb4/ng:webp/ngcb4)
If so, these are open a couple of turns at most.
The TRV valve:
![yorkshire-fittings-belmont-angled-vertical-anti-theft-trv-valve-and-body-b4452-4-anti-theft-p21329-16530_medium.jpg](https://www.jtmplumbing.co.uk/images/yorkshire-fittings-belmont-angled-vertical-anti-theft-trv-valve-and-body-b4452-4-anti-theft-p21329-16530_medium.jpg)
This is open less in warmer rooms and more in colder rooms.
Yes, there is definitely no air in system as I worked from downstairs i.e. closest radiator to the upstairs furthest radiators.
Hope this makes sense.