Re: Hotpoint fridge/freezer Mod. FF187E
frozen up evaproator in Freezer at a guess. take the cover off inside the freezer and have a look. sensors not replaceable on this one so test the heater and thermal fuse, if they are ok then it will be pcb. early ones are fitted to rear, later ones are in the top panel. both will need the smart card reader to programme, if the pcb is in the top it will also need the 2007 low end adaptor to programme it.
could be worth a shot at defrosting it and see how it goes.
if it is not frozen up then check the baffle in the fridge, could be jammed.