My fridge/freezer has suddenly stopped working?

Hi I have a Liebherr Comfort under counter fridge with small freezer compartment. It is not working now and it would seem that it stopped freezing overnight as the ice was already melting when I got up this morning. I checked the power and the usual on/off routine but no luck. I have taken out the ice and cleared the freezer compartment now. The light is on but it is red - I don't know if this is the usual color or not. The temp dial works in the sense that if I turn it all the way down to zero, the red light goes off. But there is no noise from the fridge and I cannot see any evidence of cooling. Any advice is helpful, thank you.