It does sound as though it’s working. But I’ve just checked again and in fact on the inside of the fridge unit, on the upper left hand side, it’s actually warm to the touch – the longer I leave it on the warmer it gets. So it’s actually heating up the fridge.
The LED light does not come on full but is much dimmer than normal (although it’s stopped flashing).
I don’t think it was cooling properly before I defrosted it as the items on the top shelf of the fridge didn’t feel cold at all.