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The motorised valve is a component that is responsible for the route of the boilers water. These valves use a motor that is fitted to the top of the valve to control the flow of heating water to either the central heating or hot water system. They are available in two main types, 2 port or 3 port valves. Electrically controlled valves are also very important for the smooth and efficient running of the central heating, so when they malfunction or fail it is very obvious. If a valve fails it needs to be replaced straight away. Plumbers are professionals. Here is a basic guide to the replacement of a new complete valve: Firstly, always make sure that the replacement is the correct one before you begin.In the consumer unit or fuse box, isolate the central heating by reoving the fuse or turning off the MCB (Mini Circuit Breaker). Remove the cover of the terminal box on top of the valve and test that there is no voltage at the motor, making a note of the cable connections, as this will make reconnection more straightforward. Disconnect the cables and place them out of the way. A Plumber is a fully qualified technician.Once the valve is isolated, remove the valve by cutting through the pipe on each side, or if undo cap nuts if fitted.Re-fit the new valve with compression joints on each side of the new valve pipework, then tighten the valve cap nuts. Again, these might be fitted already. Re-connect the cables to their terminals, following the notes, then insert the fuse or switch on the breaker. Re-fill and bleed the system, and test the control valve and for any leaks. To Replace A Defective Motor: There might be a requirement to change a defective electric motor. However, this can be done without draining the system.Firstly, isolate the electrical supply to the whole system completely as motor driven valves can have a permanent live supply. Remove the top cover, undo and take out the one screw that holds the motor in place. Open the valve with the manual lever, and remove the motor. Note the connections and then cut the two motor wires. Fit the new motor, operating the manual lever, spring it back to its shut position. Re-secure the motor holding screw. Strip back and connect the wires, using the new connectors. Replace the cover. Now, turn on the power for the system and test the operation of the valve, checking for correct operation and leaks.