When only the HW is selected the CH 2 way valve is correctly closed and HW open. However the radiators upstairs get warm with the heat coming from the return pipes. So, in summer we turn off the TRVs on the rads.
The manual bypass is 1 turn open, and you can feel the pipe below the bypass getting hot when CH is on - would replacing the manual bypass with an automatic bypass help stop this?
The manual bypass is 1 turn open, and you can feel the pipe below the bypass getting hot when CH is on - would replacing the manual bypass with an automatic bypass help stop this?