I need some help, having real difficulty balancing my radiators. Got modern slim rads upstairs, columns downstairs. Downstairs the rads are all on the right way. Upstairs, TRVs and lock shields are mostly on the wrong way. I understand they are bidirectional, but when trying to balance the system, the lock shield side (inlet in many cases) gets v hot and the TRV doesn’t. The rads do get hot upstairs… but downstairs they’re not. I can’t get the inlet and outlets to match temperature-wise if I keep lockshield valve a quarter open. So does that mean, as they are effectively wired backwards, that I need to open the lockshields more, to get the valves to within 12c? As this seems to go against the normal way to balance the system. I’m obviously a bit lost here. I just want hot radiators downstairs! Thanks all.