Remote not working with Amstrad DRX 400?

Hi all,

Firstly, apologies if this question has already been asked...Over night our sky remote just stopped working, the light at the top of the remote flashes but the light on the box itself does nothing.
We have purchased a new remote but it has not helped. We have tried all the normal things to reset. (pressing select and red etc but I can't find any codes for an amstrad drx 400. Does anyone have any idea what I need to do to get it to work again..?

Huge thanks in advance