What’s your starting temp? And once your reached -10c what was your cooling % at to maintain it there? These are two very important figures to determine if it’s working right.
There was a bug in app a few months ago that caused it to have really slow cooldown times. I think it’s fixed in latest version. Easiest way to tell is that within <1 min cooling % should climb up to 75% or more.. in the bugged version it would stay like 3%, climb to maybe 5%.