Hi i have a hotpoint FFA91 and the fridge compartmet has been trying to cool down to 3 degrees since sat night (display showing 3 ^ flashing arrow upwards ). I have looked at other posts and belive it is a common fault but no posts refer to a FFA91.
Try a total defrost over 48 hours to remove any possible excess ice build up in the freezer.
If that doesn’t work, then engineer time on one of these to be honest as they aren’t the same principle as the FF?? range. Try Repairs@ should the need arise 🙂