I’m trying to figure out what kind of defect would cause that. The heating elements of a fridge, the air exchange that has the hotter refrigerant, are all outside the box I believe. If the compressor fails, the refrigerant doesn’t move and doesn’t move heat. So it’d just be an insulated box, right? I think that’d get hotter an ambient but I’m not sure I’d say it’s “heating”.

I’ve seen this happen when the condenser coil is outside and during electrical work to the building the phases were swapped so the unit essentially ran in reverse.