AEG Santo standalone fridge , display error?

Hi. I am working on an AEG Santo standalone fridge model 3688-6kA, PNC927717621. The original fan & PCB were damaged by a power surge. I replaced the entire controller PCB wiring harnesses and probes, fan.The fridge now shows a line through the centre of the"8" display. Nobody seems to know what this means. It isn't a square in the upper or lower half. Everything else seems to be working/cooling. Temperature selects and displays when changed but reverts to the line through the display when it is supposed to revert to actual cabinet temperature.