Hoover HNMF2805AL-80 Frost free F/F freezing in fridge?

I have found the fridge to be freezing everything. I have changed the pcb but it still over freezing everything. This f/f stands 1800mm tall.It has a wet wall in fridge instead of air flow from the freezer. The instructions for the pcb tell me to only cut tabs off if the f/f is either 1900mm high, or if it has air flow from freezer. It has also occured to me that the fridge sensor may need replacing but have never changed a fridge ntc in my life as they seem very reliable. I can’t imagine anything wrong with gas side due to it getting down to temp in 1st place. Any ideas on this please???