Reduce the room temperature thermostat to less than room temperature;- also deselect the radiators at the programmer. Open all the radiator thermostatic and isolator valves. Then bleed air/gas out of all the upstairs radiators-- the screw bleed core is at the top of each radiator, one end only.
When all upstairs radiators have been primed, bleed all the downstairs radiators. With all radiators bled, and bleed nipples closed, select radiator heat at the controller, and set the nearby wall-thermostat to 21C.
DIY how to tutorial projects and guides - Did you know we have a DIY Projects section? Well, if no, then we certainly do! Within this area of our site have literally hundreds of how-to guides and tutorials that cover a huge range of home improvement tasks. Each page also comes with pictures and a video to make completing those jobs even easier!