You will need to locate the circuit breaker that your charger has been connected to. This is usually located in your main consumer unit or may have been installed as a separate switch.
Pull the switch down into the OFF position to turn the charger off and wait for 10 seconds. This will allow any residual charge to drain away and the charger to power down completely.
Push the switch up into the ON position and the charger may take a minute to power back up.
A successful connection will be confirmed by the following connectivity symbols located in the top right-hand corner of the display screen.