Give this a try:
https://helpforum.sky.com/t5/Sky/code-for-remote/m-p/3073017#M88271
If it works you can then have the remote tell you what the code is by doing this if you want to write it down somewhere:
Press TV,
Hold Select and red together until the red light at the top of the Sky remote flashes twice.
Press 990, and the LED at the top of the remote blinks twice.
Press 1, take note of the number of red LED blinks, as this indicates the first digit of the code.
Press 2, take note of the number of red LED blinks, as this indicates the second digit of the code
Press 3, take note of the number of red LED blinks, as this indicates the third digit of the code
Press 4, take note of the number of red LED blinks, as this indicates the fourth digit of the code.
(0 is represented by no blinks when you press the key.)
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