Two days now the local Tesco fridges have been emptied and covers down with notices saying they are having a technical problem.
The technical problem being, as far as I can ascertain, that these machines have a maximum operating ambient temperature and the shop went over it. They told me in the fuel station (where the fridges were working), that it wasn't just Tesco but Lidl, Aldi and Sainsbury's.
They seen to work just fine in our supermarkets in France and we don't hit 40C very often either.