Beko cda543fw fridge freezer

[redroge]

The fridge in my beko cda543fw is running at -2c I,ve changed the control board on the back of the fridge and the potentiometer board in the fridge as recommended on the net but it,s still freezing up .
There must be a dodgy sensor but I can only think it must be foamed in at the back of the fridge does anyone know and where I can get a replacement, Ive been on to beko but they just want to send an engineer!

[mikeref]

Not familiar with Beko. It is likely a Damper issue if fridge section relies on air from the Freezer.
PC controlled damper may be damaged. Mechanical failure.