To pair a new remote you need to follow the steps below:

1) Put unit in stand-by mode
2) Press and hold the "MODE" button on the CST remote control
3) The LED on the remote will start to blinking
4) Press and hold the "MODE" button on the unit until a double beep is heard
5) A fast flashing dot will appear on the unit display
6) The pairing is completed when a double beep is heard and the unit display returns back to the standby mode

Note: the pairing needs to be completed within 60 seconds.