WHY IS THE RED LIGHT ON IN MY FREEZER?

This is really worrying. I've just taken a batch of quiche out to the freezer in the shed, only to discover the red light is on and everything appears to be slightly softer than it should be. I've turned the thermostat up (or down) and put the fast freeze on and now its like Blackpool Illuminations with the red light being joined by the green and amber. Hopefully, the red one is going to go off shortly and everything will be okay. It MAY be that the door hadn't been closed properly. I hope this is the case. Because I stand to lose all the baking I've done ready for Christmas, baking for coffee shops and lots of meat - and I will be really upset if that is the case.