The usual scenario for balancing a central heating system, is when a new installation has been carried out, or a new boiler has ben installed with the existing pipework. It may just be that the system has decided to act up. However, this process is fairly straightforward to accomplish, but if you are not confident call a professional service like Holland Park Plumbers who only use skilled tradespeople. The central heating pump speed can be adjusted if the pump is of a variable speed type, also, if a variable headed pump has just been installed, the installer should balance the radiators, and then adjust the speed of the pump to find an optimum temperature for every room, so if you can’t increase a room’s temperature purely by opening the radiator valves, then adjust the speed of the pump. Before you make any adjustment to the pump, you need to be sure that all your radiators are showing the same drop in temperature. A Holland Park Plumber is a fully qualified professional. To Balance you can use thermometers that will clip onto the radiator and read the temp. Connect one of these thermometers to the feed pipe at a point just below the radiator valve and the other one ata similar point on the return pipe, also below its valve. The temperatures shown by the thermometers should be around 11°C (20°F). If not, close the lock shield valve a touch to increase the difference in temperature or open the valve to reduce it. Now all the radiators are balanced you can now adjust the speed of the pump slowly and in small turns until the temperature of the radiators is the one you require. Turn the pump off before making each adjustment. Any problems it is a good idea to call a professional in.“