In case anyone finds this on a search…..no idea what the problem was, it was at daughter’s house and her solution was to buy a new (but different) fridge/freezer.
I did note that the RSH1 is subject to a recall type thing, but Samsung said it had been done on this 2008 machine in 2011, by the previous owners of the house. They offered 25{e5d1b7155a01ef1f3b9c9968eaba33524ee81600d00d4be2b4d93ac2e58cec2d} off a new one from Samsung’s online shop, and I noted machines there have a 5yr warranty. But Samsung fridge freezer have such a dodgy reliability record that she wanted to move away. There are multiple reports of people paying to get them fixed and then it failing again a couple of months later.
I was most relieved that the new one powered up OK – I had checked it on another circuit but once RCDs start tripping in a house things can get very random.