Been out to this one today Frez evap frozen solid Iam thinking along the lines of the defrost sensor or defrost Htr sensor as the defrost htr seems to test out ok approx 85 ohms.
press and hold top left and fridge temprature buttons together for approx 15 sec then press the fridge temp,first will be forced run,second press forced fridge defrost,third press freezer and fridge defrost.