Re: Thermostat doesn’t cut out automatically
If the fridge was running all the time and the rest of the system was OK you would have had stuff freezing.
Switch off at plug.
I would remove fridge from the cupboard fittings.
Check underneath that the condenser coils are not blocked with fluff,there is also a small fan that pulls air underneath,clean everything undr there and try it again.
If still running constantly it’s time for an engineer or a shopping trip!