Electrically controlled valves are important for the smooth and efficient running of the central heating, so when they malfunction or fail it is very obvious. Therefore sometimes it may be necessary to fit a new valve or the motor that drives the valve. Plumbers supply and fit new control valves. Before you attempt this, you should be confident with some experience, otherwise you may cause more problems.Replacing The Valve Complete:Always make sure that if you are replacing something that the replacement is the correct one before you start.1). At the consumer unit or fuse box take out the fuse or turn off the MCB (Mini Circuit Breaker) for the central heating controls.2). Take the cover off the terminal box on the small motor and test that there is no voltage at the motor, and note down the terminals as this should make reconnecting easier. Undo the wiring and put the cable to the side.3). When you are happy that the valve is isolated, remove the valve by cutting through the pipe on each side. 4). Re-fit the new valve using compression joints on each side of the new valve pipework, then tighten the valve cap nuts. 5). Re-connect the valve’s cable to the junction box, then insert the fuse or switch on the breaker. A Plumber can fit all motor driven valves. Re-fill the system and test the control valve and for any leaks.New Motor:There may be a need to change a defective electric motor for the valve. However, this can be replaced without draining the system.1). First isolate the electrical supply to the whole system completely as motor driven valves can have a permanent live supply.2). Remove the top cover, undo and take out the one screw that holds the motor in place. 3). Open the valve with the manual lever, and remove the motor. Cut off 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, de-isolate the power for the system and test the operation of the valve.

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