I'm not sure then. Mine only takes an hour to get to temp so if it were me I would give Brinsea a call they have good customer services so should be able to point you in the right direction as what to do next.
No shouldn't do. I would still double check that you have the cooling option off. Brinsea recommends that if you wish to use the cooling option you start doing it after the seventh day. What day are you on?
I don't have the mini but I do I have octagon 20 adv with the same digital display. Brinseas are usually great at getting to and holding temp. So my first thought would be to make sure you have set it to the temperature you want it at and have saved it in the menu. Also to make sure it's...