Years ago my son switched off my big chest freezer, he was only a toddler and saw the red light! I realised after about 24 hours and didn't open the door but phoned my sister, a store manager for a large chain of supermarkets. She told me not to worry, just switch it on again on the boost mode as where she worked they regularly sold food that had been defrosted! I did however make sure everything was very thoroughly cooked before we ate it.
It was a long time ago as i assume current regulations would stop shops doing this. But I wonder when I think about the times I've found my frozen veg in a solid block!